perl loops

Perl provides several types of loops to iterate over a set of values or execute a block of code repeatedly. Here are the three main types of loops in Perl:

1. for loop: The for loop allows you to iterate over a list of values or a range of numbers. It follows the syntax:

for my $variable (list or range) {
    # Code to be executed
}

Here, $variable represents the loop variable that takes each value from the list or range one by one. The code within the loop block is executed for each value.

Example:

for my $num (1..5) {
    print "$num\n";
}

Output:

1
2
3
4
5

2. while loop: The while loop repeatedly executes a block of code as long as a specified condition is true. It follows the syntax:

while (condition) {
    # Code to be executed
}

The code within the loop block is executed as long as the condition remains true.

Example:

my $count = 1;
while ($count <= 5) {
    print "$count\n";
    $count++;
}

Output:

1
2
3
4
5

3. do-while loop: The do-while loop is similar to the while loop, but it checks the condition at the end of the loop. This ensures that the code block is executed at least once. It follows the syntax:

do {
    # Code to be executed
} while (condition);

The code within the loop block is executed first, and then the condition is checked. If the condition is true, the loop continues; otherwise, it exits.

Example:

my $count = 1;
do {
    print "$count\n";
    $count++;
} while ($count <= 5);

Output:

1
2
3
4
5

These are the basic loop structures in Perl. You can choose the appropriate loop type based on your requirements and the specific conditions you need to handle.