The If else function in Perl is a conditional control statement, where a set of statement is executed based on a condition.

Syntax:

    if (expr1)
     {
      Statement to be executed
     }
    else
     ( 
      Statement to be executed
     )

In the above syntax a set of statement is executed if "expr1" is true, else a different set of statement is executed that is after the else statement.

    #! C:\programfiles\perl\bin\perl
    print "content-type: text/html\n\n";
    $a = "HIOX";
    $b = length($a); 
    if ($b== 1)
     {
      print "The string has one character\n";
     }
    else
     {
      print "The string has many characters\n";
     }

    The string has many characters 

In the above example the length of a string "HIOX" is checked and the appropriate result is displayed as the length of the string is not 1.