In Perl, you can use the conditional operator ? : to assign this or that based on a condition. The basic syntax for this type of assignment in Perl is:
$var = (condition) ? this : that;
Here's an example where we will assign a value to a variable based on a condition:
my $age = 25;
my $message = ($age < 18) ? "You are under 18 years old" : "You are 18 years or older";
print $message;
In this example, we check whether the variable $age is less than 18. If it is, we assign the string "You are under 18 years old" to the variable $message. If it's not, we assign the string "You are 18 years or older".
You can also use this type of assignment for more complex conditions, for example:
my $x = 10;
my $y = 20;
my $z = ($x > $y) ? ($x - $y) : ($y - $x);
print $z;
In this example, we assign the value of $x - $y to the $z variable if $x is greater than $y, otherwise we assign the value of $y - $x. Here, the value of $z becomes 10 - 20 = -10, since $x is less than $y.