Perl IF Statement

Perl Conditional Statements

A Perl if statement consists of a boolean expression followed by one or more statements.

Syntax

The syntax is as follows:

if(boolean_expression){
   # Executed when boolean_expression is true
}

If the boolean expression boolean_expression is true, the block of code inside the if statement will be executed. If the boolean expression is false, the first set of code after the if statement (after the closing bracket) will be executed.

Flowchart

Example

#!/usr/bin/perl

$a = 10;
# Using if statement to check the boolean expression
if( $a < 20 ){
    # Executed when the boolean expression is true
    printf "a is less than 20\n";
}
print "The value of a is : $a\n";

$a = "";
# Using if statement to check the boolean expression
if( $a ){
    # Executed when the boolean expression is true
    printf "Variable a is true\n";
}
print "The value of a is : $a\n";

Executing the above program will output:

a is less than 20
The value of a is : 10
The value of a is :

Perl Conditional Statements