In this tutorial, we will learn about if statements in Perl. We will cover the basics of conditional execution using if statements.
An if statement is a conditional statement that executes a block of code if a specified condition is true.
The syntax for the if statement in Perl is:
if (condition) {
# Code block to execute if condition is true
}
The if statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, it is skipped.
The following is the flowchart of how execution flows from start to the end of an if statement.
$num
.$num
.$num
is even.$num
is even or not.$num = 10;
if ($num % 2 == 0) {
print "$num is even.";
}
10 is even.
$str
.$str
.$str
starts with a specific value.$str = 'Hello, world!';
if ($str =~ /^Hello/) {
print "String starts with 'Hello'.";
}
String starts with 'Hello'.
$num
.$num
.$num
is positive.$num
is positive or not.$num = -5;
if ($num > 0) {
print "$num is positive.";
}