# Built-in Perl Arithmetic Functions : Arithmetic Operators « Language Basics « Perl

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 Perl » Language Basics » Arithmetic Operators
Built-in Perl Arithmetic Functions
 ```    atan2(Y,X)  Returns the arctangent of Y/X. cos(EXPR) cos EXPR    Returns the cosine of EXPR in radians. If EXPR is omitted, takes cosine of \$_. exp(EXPR) exp EXPR    Returns e to the power of EXPR. If EXPR is omitted, gives exp(\$_). int(EXPR) int EXPR    Returns the integer portion of EXPR. If EXPR is omitted, uses \$_. log(EXPR) log EXPR    Returns logarithm (base e) of EXPR. If EXPR is omitted, returns log of \$_. rand(EXPR) rand EXPR rand        Returns a random fractional number between 0 and the value of EXPR.              If EXPR is omitted, returns a value between 0 and 1. sin(EXPR) sin EXPR    Returns the sine of EXPR in radians. If EXPR is omitted, returns sine of \$_. sqrt(EXPR) sqrt EXPR   Return the square root of EXPR. If EXPR is omitted, returns square root of \$_. srand(EXPR) srand EXPR  Sets the random number seed for the rand operator. If EXPR is omitted, does srand(time).                 ```
Related examples in the same category
 1 Demonstrates the difference between pre- and postincrement 2 Adding a number and a string 3 You can combine operators such as +, -, and * with the assignment operator 4 Power with ** 5 Minus power 6 Float power 7 Left shift 8 After incrementing 9 After pre-increment: ++\$a * 2 10 After pre-decrement 11 Using auto-increment operator for a string with digits 12 Using auto-increment operator for a string 13 A program that uses the pre-increment operation. 14 Post-increment operation. 15 Operators demo: Arithmetic Operators 16 Precedence and Associativity 17 Add 3 to \$var; same as \$var=\$var+3 18 Subtract 1 from \$var 19 Square \$var 20 Modulus operator 21 Arithmetic Operators in action 22 Autoincrement and Autodecrement Operators and Assignment 23 Numeric Operators 24 Use parentheses wherever possible to force precedence. 25 Remainder and power 26 To force perl to perform an operation of lower precedence first, use brackets 27 An example of exponentiation 28 %, the remainder, or 'modulo' operator 29 The autoincrement operator 30 Basic Numeric Operations 31 Increment and Decrement Operations 32 Increment and Decrement Operators 33 Basic arithmetic operators. 34 Pre-increment string value