# Java Evaluate Math Expression

Sometimes we face tasks when we need to ask our users not only to enter some values, but to write down the whole formula in order to calculate the values we need automatically. Evaluate the expression when x=5. mXparser is a super easy, rich, fast and highly flexible math expression parser library (parser and evaluator of mathematical expressions / formulas provided as plain text / string). Example Problem Evaluate the expression 2x for x=3. By propelling students to actively participate in their own learning, WebAssign empowers educators to develop confident, self-sufficient learners. $$4\cdot 5-3$$ And then we calculate the answer. APPLIES TO: SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse Is a combination of symbols and operators that the SQL Server Database Engine evaluates to obtain a single data value. This might be to show a number within the text of a page or to pass a number to a custom tag. Thanks to Scalar scientific calculator, defining arguments and functions, as well as using them in subsequent calculations, expressions and functions graphs, has never been easier. Valid operators are +, -, *, /. Expr4J provides an expression calculation engine (and general purpose expression language) for Java and provides: A general purpose expression parser, intended to be used where mathematical expressions are useful (eg. With this library you can allow your users to enter an arbitrary formula as a string, and instantly evaluate it. Expression can contain parentheses, you can assume parentheses are well-matched. Jep is a Java library for parsing and evaluating mathematical expressions. Example strings: "2+3" or "20-70" or "12>3"and want to avoid a lot of if-then-else statements. Evaluate the value of an arithmetic expression in Reverse Polish Notation. Apr 19, 2019 · How to Simplify Math Expressions. You possibly have quite a bit of work to do. How to inserting images 30. For simplicity, you can assume only binary operations allowed are +, -, *, and /. When we encounter n! (known as 'n factorial') we say that a factorial is the product of all the whole numbers between 1 and n, where n must always be positive. Introduction: In this article i am going to explain how to evaluate/solve the arithmetic/mathematical expression/formula which is in string form in asp. The order of evaluation of operators in an expression is determine. From the NCETM website:. We use fractional exponents because often they are more convenient, and it can make algebraic operations easier to follow. This string should contain functions (avg, max, min, ) applied to vectors or simple numbers. I've studied Java for 2 and a half months. Use a matcher to find any math operations and replace the math operation with the answer to that math operation. Parsing is fun, and valuable to study, but if you just need to evaluate user-supplied expressions, use a script. It features big numbers, complex numbers, matrices, units, and a flexible expression parser. May 07, 2019 · Since Java 8, we can leverage for-each loops in a slightly different way. Nov 14, 2007 · Recently, I was looking for a tool to evaluate some mathematical expressions in Java, which were stored in some configuration file. A block is a group of zero or more statements between balanced ___ and can be used anywhere a single statement is allowed. parse(expr), math. Computer science's traditional methods for evaluating mathematical expressions are awkward and difficult for the untrained user; software engineer Nikola Stepan aims to change all that. EvalEx is a handy expression evaluator for Java, that allows to evaluate simple mathematical and boolean expressions. Converting string to math expression in android. The form of a mathematical expression that is simplest for one problem turns out to be complicated or even unsuitable for another problem. The meshgrid function creates MATLAB variables X, Y, and Z in the MATLAB workspace. Expression trees #. Browse more Java8 Examples. In other words, when you evaluate something, you find its value. Each programming language and application has its own rules for what is legal and illegal. So to evaluate the expression, we really just have to substitute a with 7 and substitute b with negative 4 because they're saying evaluate it when a is equal to 7 and b is equal to negative 4. Kids from pre-K to 8th grade can practice math skills recommended by the Common Core State Standards in exciting game formats. ?? Design a class named QuadraticEquation for a quadratic equation ax2 + bx + c = 0. Jep supports user defined variables, constants, and functions. Then type the @ symbol. Is 2 greater than 3? Does 2 + 2 equal to 4? Does guess equal to secretNumber? (Remember number guessing game. Use a matcher to find any math operations and replace the math operation with the answer to that math operation. Shell script variables are by default treated as strings, not numbers, which adds some complexity to doing math in shell script. me(' 2 * 4 + 2') == 10 assert Eval. These classroom math games were created with cooperative learning built into the overall experience. Then evaluate the expression using the order of operations. NET framework that allows you to build a string that gets interpreted at run time. The tokenizer I built in that article was the first component of my quest to render and solve math expressions using Javascript, or any other language. pow method 3 - More power multipliers. js is an extensive math library for JavaScript and Node. Python has one, Ruby has one, and -- as of JDK 9 -- Java has one. I'm trying to write a Java routine to evaluate simple math expressions from String values like: "5+3" "10-40" "10*3" I want to avoid a lot of if-then-else statements. Boolean expressions are very similar to mathematical expressions, but instead of using mathematical operators such as "+" or "-", you use comparative or boolean operators such as "==" or "!". One should spend 1 hour daily for 2-3 months to learn and assimilate Java comprehensively. INTEGER, REAL or COMPLEX). Expression trees #. There are three kinds of statements: expression statements, declaration statements, and control flow statements. Explanation:. When we substitute a specific value for each variable, and then perform the operations, it's called evaluating the expression. Q&A for people studying math at any level and professionals in related fields Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. For arithmetic expressions, multiplication and division are evaluated before addition and subtraction, just like in mathematics. Stack is an area of memory that holds all local variables and parameters used by any function and remembers the order in which functions are called so that function returns occur correctly. How to evaluate the determinant of a 2 by 2 and 3 by 3 matrix? Top Answer. But with the introduction of ScriptEngine class in JDK 1. This class is used to evaluate mathematical, string, Boolean and functional expressions. Before we go any further, let me say; JavaScript has nothing to do with Java. Introduction. It is written "a/b," where "a" is called the numerator and "b" is called the denominator. Free math lessons and math homework help from basic math to algebra, geometry and beyond. bat 5 3 5 choose 3 = 10 > binom. As part of this lesson, there are going to be some small programs, partly to illustrate some important aspects of programming in Java and partly to give you, the student, some opportunities to incrementally improve your understanding of the language. The Java Scripting functionality is in the javax. The notation may vary…. From the NCETM website:. Symbolic Math in Matlab. However, in practice this technique has a nasty side effect. To keep with script programming paradigm and allow for better math support, languages such Perl or Python would be better suited when math is desired. Jan 05, 2017 · java-expr-eval. For a list of changes, see Changes for Java 1. It provides operators for five basic arithmetic calculations: addition, subtraction, multiplication, division, and taking the modulus. Simplify Symbolic Expressions. Parsing math expressions with JavaScript. The stack organization is very effective in evaluating arithmetic expressions. in a spreadsheet) and compatible with Excel. The second xsl:variable element references another variable, does some math, and makes a function call. The Java Scripting functionality is in the javax. Integer Arithmetic. How to create the javascript regular expression for number with some special symbols javascript,regex what can be the java-script regular expression which gives the numbers with some symbols For example following condition must be pass. Feb 19, 2016 · Of course we can take a shortcut and subtract the number of 2’s on bottom from the number of 2’s on top. The problem you will have is that there is no "Interpret" function in. Sep 17, 2017 · When using several operators in the same expression, one must consider Java's order of precedence. Key Features: Uses BigDecimal for calculation and result; No dependencies to external libraries; Precision and rounding mode can be set; Supports variables. An expression that evaluates to a non-zero value is true. In computer science, the shunting-yard algorithm is a method for parsing mathematical expressions specified in infix notation. These classroom math games were created with cooperative learning built into the overall experience. This page can show you how to do some very basic integrals. Since these quantities are represented by their respective exponents, all we need to do. C++ program to evaluate an expression entered in postfix form h> #include #include motor Keyboard Interface 8951 Java program Graphics Queue. Evaluate Mathematical Function in MATLAB. athenahealth is committed to a policy of equal employment opportunity—that’s why we recruit and hire applicants without regard to race, color, religion, sex (including pregnancy), national. That is, a. The CodeDom Calculator can be used in one of two ways: a) just enter some math expression you want to evaluate using C# Syntax. Have a play with a simple computer model of reflection inside an ellipse or this double pendulum animation. The easiest way to evaluate expressions is to use editor tooltips. Jul 05, 2001 · This template has a series of xsl:value-of instructions whose select attributes use the values of the numbers element's x, y, and z child elements to do various kinds of math. exp4j comes with a standard set of built-in functions and operators. - Calculator. •Examples: ^2*5 _, ^1. Hence there may be some perfectly clued up programmers who are still left wondering what the sausage is doing outside of the bun. mXparser provides basic functionalities (simple formulas parsing and calculation) and more advanced ones (i. Statements are roughly equivalent to sentences in natural languages, but instead of ending with a period, a statement ends with a ___. The vector product and the scalar product are the two ways of multiplying vectors which see the most application in physics and astronomy. com and read and learn about operations, mathematics and plenty additional math subject areas. Postfix notation [1] is a notation for writing arithmetic expressions in which the operands appear before their operators. Contribute to darius/expr development by creating an account on GitHub. Matches strings against configurable strings, globs, regular expressions, and/or functions Math. The hardest thing about doing word problems is using the part where you need to take the English words and translate them into mathematics. This problem requires you to evaluate an indefinite integral of the given function f’(x). You can evaluate expressions easily if your Java application already accesses a database, without using any other JARs. Because both expressions compared by the & operator must be true for the entire expression to be true, there’s no reason to evaluate the second expression if the first one returns false. In practice, we. Jan 29, 2017 · Java do not have an eval() method. the following defines the simple type “SSN” using a regular expression to require the element to contain a valid US social security number. - Calculator. So, in the examples that follow, I'll be demonstrating how to work with these sorts of expressions. In the example above, the condition was whether the isValid variable was true or false. If x is 2, then the expression 9 + x has a value of 11. Key Features: Uses BigDecimal for calculation and result. In algebra, we begin to see variables, or letters that are used to represent numbers. The 2 is called the base. A single mode arithmetic expression is an expression all of whose operands are of the same type (i. Learn vocabulary, terms, and more with flashcards, games, and other study tools. There are no precedence rules to learn, and parentheses are never needed. The idea is simple start from the first character and traverse from left to right and check for errors like two consecutive operators and operands. Ask Question I am interested in solving this problem using Java. Thanks to Scalar scientific calculator, defining arguments and functions, as well as using them in subsequent calculations, expressions and functions graphs, has never been easier. It currently supports user defined variables, constants, and functions. Free math tutorials and problems to help you explore and gain deep understanding of math, calculus, trigonometry and geometry topics. From simple to complicated, you have a lot of choices. Then type the @ symbol. Expression language syntax is ${name} and we will see how we can use them in JSP code. A useful Lua idiom is x = x or v, which is equivalent to if not x then x = v end i. The Remainder or Modulus Operator in Java. The fully parenthesized expression is the inﬁx form. The shunting yard algorithm can be used to directly evaluate expressions as they are parsed (it is commonly used in electronic calculators for this task), to create a reverse Polish notation translation of an infix expression, or to create an abstract syntax tree. Converting string to math expression in android. The Math class contains methods for finding the maximum or minimum of two values, rounding values, logarithmic functions, square root, and trigonometric functions (sin, cos, tan etc. Allow easy integration from Groovy into Java through convenience methods. Math expression solver. Supports logging the parsing/evaluation steps done to a Writer or an OutputStream. bat 100 2 100 choose 2 = 4950 The string n choose k = is output to stderr, while the result is echoed to stdout. ANTLR is a library that uses a grammar definition file to generate code to create a complex pattern matching program. Nov 27, 2017 · You can evaluate expressions easily if your Java application already accesses a database, without using any other JARs. To evaluate, call the recursive version of the method to get the result from the left subtree, do the same for the right subtree, then combine these two results using the operator. The parentheses surrounding the expression are optional, but it is good style to use them. Traverses the expression tree and produces the correct answer, which should be an integer. Lookahead and lookbehind, collectively called “lookaround”, are zero-length assertions just like the start and end of line, and start and end of word anchors explained earlier in this tutorial. Is there an javascript-like Evaluate() function in C# or any other similar method? I have a simple mathematical expression (no brackets, only -, +, / and * operands) stored in a string and I want to be able to evaluate that and get the result in a float. Evaluate an Arithmetic expression using Stacks in Java. In this set of exercises you are given parametric equations. September 2001. Evaluating expressions in the editor. Oct 07, 2014 · Parsing mathematical expressions into a binary tree — Part 1 Parse and evaluate “(1+2)*3” expression. Department of Mathematics, UC Davis · One Shields Ave · Davis, CA 95616 · (530) 752-0827. The graphing screen is large and you will have to move from this text screen to the graphing screen by means of the mouse while learning how to use the applet. A calculator will do floating point arithmetic for the expression: 7/4 A calculator will show this as 1. 4/18/2015 1 Lecture Fourteen Infix, Prefix and Postfix Expressions Algebraic Expression An algebraic expression is a legal combination of operands and the operators. However, if the given expression is complex, i. An extensive math library for JavaScript and Node. Some common situation includes on a program contest evaluation system, on a dynamic business logic control, on evaluation of dynamic math expression, or even on evaluation of test case. Evaluating Expressions. , it sets x to a default value v when x is not set (provided that x is not set to false). It currently supports user defined variables, constants, and functions. Tennessee students have various mathematical needs that their K-12 education should address. In other words, series is an important topic even if you won’t ever see any of the applications. A parametric representation of a curve is not unique. This applet will graph a given function on an interval [a, b], display various graphs that arise in the numerical evaluation of integrals, and evaluate the associated sums. Both and and or use short-cut evaluation, that is, they evaluate their second operand only when necessary. Evaluate: 2x 3 – x 2 + y for x = 3, y = –2. This is useful when you don't want to immediately compute an answer, or when you have a math "formula" to work on but don't know how to "process" it. Simple C++ Math. ghci> myDrop 2 "abcd" "cd" ghci> tail "bcd" "cd". In postfix notation, the need for parentheses is eliminated and the priority of the operators is no longer relevant. Integer Arithmetic. Expr4J provides an expression calculation engine (and general purpose expression language) for Java and provides: A general purpose expression parser, intended to be used where mathematical expressions are useful (eg. Appendix A: Operator Precedence in Java. A statement forms a complete unit of execution and is terminated with a semicolon (;). Mutlivariable Functions and partial derivatives are included. With this package you can allow your users to enter an arbitrary formula as a string, and instantly evaluate it. Scalar is a powerful math engine and math scripting language, that combines the simplicity of standard calculators with the flexibility of scripting. The four arithmetic operators and parentheses are allowed in the expression. The problem: You need to evaluate dynamic expression in your java code. Mar 10, 2014 · I'm interested in this solution too. What is meaning of various equation 32. Generate a quartz cron expression with an easy to use online interface. Most mathematical statements you will see in first year courses have the form "If A, then B" or "A implies B" or "A$\Rightarrow$B". $$4\cdot 5-3$$ And then we calculate the answer. download skript expressions free and unlimited. the act of saying what you think or showing how you feel using words or actions: 2. The scalar product of two vectors can be constructed by taking the component of one vector in the direction of the other and multiplying it times the magnitude of the other vector. Here is the change of base formula. Free online calculators for math, algebra, chemistry, finance, plane geometry and solid geometry. We can use any symbol as a variable, but letters. Teaching Algebraic Expressions in a Meaningful Way Louise Chalouh Nicolas Herscovics QUITE OFTEN, algebraic expressions are introduced by stating that they involve variables and that "a variable is a letter that stands for one or more numbers. This is a VERY COMPLEX calculator. $$20-3=17$$ An expression that represents repeated multiplication of the same factor is called a power e. The main emphasis is the code execution time and not the compilation time (it is nevertheless small). a few weeks ago i was trying to implement custom functions in camunda dmn engine. In the discussions below we consider all operators to be binary. Given some queries, return the answers. You can "weigh" the expressions you want to compare by entering them on either side of the balance. The n-th root of a number can be written using the power 1/n, as follows: a^(1/n)=root(n)a. Here also we have to use the stack data structure to solve the postfix expressions. I am trying to make a truth table from an SOP boolean algebra expression. NET framework that allows you to build a string that gets interpreted at run time. - Calculator. Though a long, ungainly expression and a short, elegant one may technically. The mathematical objects are represented exactly, not approximately, and mathematical expressions with unevaluated variables are left in symbolic form. Different types of Operators. You may get some simple (but fairly useless) exercises on this topic. We're asked to evaluate the expression a squared plus 10b minus 8 when a is equal to 7 and b is equal to 4. It can handle most basic mathematical and string expressions with the built in operator set fairly easily. Numbers are treated as doubles, so resulting numbers will contain at. To evaluate expressions using JEXL, you need three things: An engine to create expressions, A context containing any variables, and; An expression; The common way of using a JEXL engine is to create it as a singleton and use this opportunity to tailor its behavior and cache through the jexlBuilder options. Java has well-defined rules for specifying the order in which the operators in an expression are evaluated when the expression has several operators. Vector Product of Vectors. Note: Division between two integers should truncate toward zero. Introduction Overview. Apr 08, 2013 · Writing a Parser in Java: The Tokenizer cogitolearning April 8, 2013 Java , Parser java , parser , tokenizer , tutorial In this short series I am talking about how to write a parser that analyses mathematical expressions and turns them into an object tree that is able to evaluate that expression. The main design goal was to create light weight expression compiler generating extremely fast code. It is thanks to you that dCode has the best Boolean Expressions Calculator tool. Variables will be needed for information that is unknown. Write an expression that obtains a random integer between 0 and 999. Nov 18, 2011 · When evaluating expressions such as the one above (known as “infix notation“), that which appears simple and intuitive to us humans, is usually not so straightforward to implement in a programming language. Most of the issues with simplifying using the order of operations stem from nested parentheses, exponents, and "minus" signs. Jul 05, 2001 · This template has a series of xsl:value-of instructions whose select attributes use the values of the numbers element's x, y, and z child elements to do various kinds of math. Numbers, symbols and operators (such as + and ×) grouped together that show the value of something. Java evaluates a Boolean expression by first evaluating the expression on the left, then evaluating the expression on the right, and finally applying the relational operator to determine whether the entire expression evaluates to true or false. The idea is simple start from the first character and traverse from left to right and check for errors like two consecutive operators and operands. Internally, it simply delegates the job to the standard loop:. After taking into account precedence and parentheses, Java guarantees that expressions will be evaluated left to right. Supports logging the parsing/evaluation steps done to a Writer or an OutputStream. This is usually written n P k. However, in practice this technique has a nasty side effect. The problem you will have is that there is no "Interpret" function in. Java, multiplication takes precedence over addition; therefore, x will get the value 19. Mar 01, 2017 · The canonical reference for building a production grade API with Spring. In Java, these operators can be applied only to primitive values, except for the sum operator (+). This module is always available. It looks like it creates a new DLL in memory each time you evaluate your function and it seems nearly impossible to unload the DLL. Math class in Java provides utility methods to do basic numeric operations like calculating square roots, exponential and logarithm. Learn more. It is thanks to you that dCode has the best Boolean Expressions Calculator tool. Neel Somani - February 17, 2015. The reverse Polish notation places the operator after numbers, for example, 3 5 * is the same as 3 * 5. ***Can you help me to write a java program to evaluate a mathematical expression written in a a Prefix Order. Sep 17, 2017 · When using several operators in the same expression, one must consider Java's order of precedence. There are worksheets, tables, charts, number lines, games, and more. Parsing is fun, and valuable to study, but if you just need to evaluate user-supplied expressions, use a script. In postfix notation, the need for parentheses is eliminated and the priority of the operators is no longer relevant. fast) way to evaluate/convert a string as/to a mathematical expression in Perl (without splitting and. Couple of days ago I've seen an interesting code snippet of a JavaScript evaluator. Mathematical expressions are groups of variables, constants and operators that represent values. For arithmetic expressions, multiplication and division are evaluated before addition and subtraction, just like in mathematics. PART I: PROGRAMMING IN JAVA CS. Most mathematical statements you will see in first year courses have the form "If A, then B" or "A implies B" or "A$\Rightarrow\$ B". RPN or Reverse Polish Notation used to be a basic of the computer programmer's world, but today it is not as well known. Using PEMDAS to Evaluate Numerical Expressions. A statement forms a complete unit of execution and is terminated with a semicolon (;). Additionally users are able to create custom operators and functions. This Java code is reading integers and arithmetic operations from a string and evaluating the arithmetic operation. Expression can contain parentheses, you can assume parentheses are well-matched. Train on kata in the dojo and reach your highest potential. APPLIES TO: SQL Server Azure SQL Database Azure Synapse Analytics (SQL DW) Parallel Data Warehouse Is a combination of symbols and operators that the SQL Server Database Engine evaluates to obtain a single data value. It provides access to the mathematical functions defined by the C standard. Tutorial on evaluating and simplifying expressions with factorial notation. Dec 30, 2004 · C++ Arithmetic Operators. script package. Each operand may be an integer or another expression. I have my code written, but my GUI is not showing. ANTLR is a library that uses a grammar definition file to generate code to create a complex pattern matching program. Java 8 Method References explained in 5 minutes February 5, 2015 3 min read At IDR Solutions we use Java 8 for the development of our products (a Java PDF Viewer and SDK , PDF to HTML5 converter and a Java ImageIO replacement). js is an extensive math library for JavaScript and Node. Aug 19, 2019 · mXparser is a super easy, rich, fast and highly flexible math expression parser library (parser and evaluator of mathematical expressions / formulas provided as plain text / string). If the primary is a mapping, the expression list must evaluate to an object whose value is one of the keys of the mapping, and the subscription selects the value in the mapping that corresponds to that key. Inﬁx form: (6 4)(3+(5 1)) Preﬁx Notation The preﬁx form of an expression can be obtained by traversing its rooted tree in preorder. The second xsl:variable element references another variable, does some math, and makes a function call. They offer an engaging and fun environment for information assimilation. EvalEx is a handy expression evaluator for Java, that allows to evaluate simple mathematical and boolean expressions. The result of all expressions thus far. If you're seeing this message, it means we're. The common log function log(x) has the property that if log(c) = d then 10d = c. js is an extensive math library for JavaScript and Node. Infix notation is the common arithmetic and logical formula notation, for example, 3 + 4. 5", evaluates them, and returns the result (7. Apr 23, 2019 · To evaluate mathematical expression in String, use Nashorn JavaScript in Java i. Write an expression that obtains a random number between 5. If an XPath expression is only used once, you can use one of the four evaluate() methods in the XPath interface to evaluate the XPath expression without compiling it first. So to evaluate the expression, we really just have to substitute a with 7 and substitute b with negative 4 because they're saying evaluate it when a is equal to 7 and b is equal to negative 4. Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. NET Description. The form of a mathematical expression that is simplest for one problem turns out to be complicated or even unsuitable for another problem. Convert a cron expression into a readable text that clearly explains when it will execute, and visualize the next execution dates of your cron expression. Java, multiplication takes precedence over addition; therefore, x will get the value 19. Can we keep track of the expression's value as well so as to avoid the evaluation at the very end of recursion?. Contribute to darius/expr development by creating an account on GitHub. Java Conditional or Relational Operators: The relational operators determine the relationship that one operand has to the other. Define a Name called E, with Refers to: =EVALUATE(SUBSTITUTE(A1,"x","*"&B1)) Then, with Formula input in A1, x value in B1, entering =E in C1 returns. Note that the math equation x = 2 * x + 1 ≠ the Java expression x = 2 * x + 1. So, in the examples that follow, I'll be demonstrating how to work with these sorts of expressions. May 28, 2019 · LanguageManual UDF; substring of A matches the Java regular expression B, otherwise FALSE. Boolean Type The simplest and most common form of boolean expression is the use a in an if-statement as shown above. expression definition: 1. 61538 For the input. About Modulo Calculator. Math Man Order of Operations - Learning Connections Use and evaluate expressions. This is usually written n P k. Challenge students and mathematics enthusiasts with these puzzles. Java, multiplication takes precedence over addition; therefore, x will get the value 19. SymPy is a Python library for symbolic mathematics. Jep Java parses and evaluates mathematical expressions with only a few lines of code. Some databases require you to use a dummy table (eg, Oracle's "dual" table) and others will allow you to evaluate expressions without "selecting" from any table. Evaluating an expression typically produces a new value, which can be stored in a variable, used to make a decision, and so on. Free online math help: review lessons, homework help, learning aids, examples, solutions, videos, games, puzzles and test preparation (eg SAT) for kids, teens. Expression Evaluation, Raise to a Power. - Calculator. With this handy applet, you can evaluate mathematical expressions step by step. This one, however, presents the same thing in pure JavaScript. How to evaluate this expression [duplicate] the Integer regular expression, or is out of range. For simplicity, you can assume only binary operations allowed are +, -, *, and /. If LE1 and LE2 are logical expressions, then LE1 OR LE2 is a logical expression, whose value is TRUE if either LE1 or LE2 have the value TRUE, and is FALSE otherwise.