Perl Tutorial
Data Types
Modules
Packages
Decision Making
Scalars
Operators
Classes
Quantifiers in RE
File Handling
CGI

Perl | atan2() Function

Last Updated : 25 Jun, 2019

This function is used to calculate arctangent of Y/X in the range -PI to PI.

Syntax: atan2(Y, X) Parameters: Y and X which are axis values Returns: Function returns arctangent of Y/X in the range -PI to PI.

Example1:

Perl

#!/usr/bin/perl

# Assigning values to X and y
$Y = 45;
$X = 70;

# Calling atan2() function
$return_val = atan2($Y, $X);

# printing the value
print "atan2 of 45/70 is : $return_val\n";

Output:

atan2 of 45/70 is : 0.571337479833627

Example2:

Perl

#!/usr/bin/perl

# Assigning values to X and y
$Y = -30;
$X = 40;

# Calling atan2() function
$return_val = atan2($Y, $X);

# printing the value
print "atan2 of -30/40 is : $return_val\n";