Perl - for Loop Syntax

In Perl programming language, "for" is used for loop control statements. It is used to iterate a set of statements or commands for a definite time or until a certain condition is met. In this example, we will look at the syntax of the "for" loop in Perl.

for ($i=0; $i < scalar(@array); $i++) {
    # Whatever Code Here
}

Explanation

1. The loop starts with the for keyword followed by opening parentheses.

2. We initialize the loop variable $i with the initial value of 0.

3. We check for the condition by using the comparison operator <. The loop will run as long as the value of $i is less than the size of the array @array.

4. We increment the loop variable $i after each iteration using the ++ operator.

5. The block of code that needs to be executed within the loop is enclosed within curly braces {}.

6. The loop will continue to iterate until the value of $i becomes greater than or equal to the size of the array @array.

Example

@array = (1, 2, 3, 4, 5);
for ($i=0; $i < scalar(@array); $i++) {
    print "Value of array at index '$i' is '$array[$i]'\n";
}

This example initializes an array @array with five elements. It then uses the for loop to iterate through the array and print the value of each element along with its index. The output of the program is:

Value of array at index '0' is '1'
Value of array at index '1' is '2'
Value of array at index '2' is '3'
Value of array at index '3' is '4'
Value of array at index '4' is '5'

Conclusion

The for loop is a powerful construct in Perl that allows you to execute a set of statements multiple times. It is useful when you need to manipulate arrays or iterate through a range of numbers. Mastering the for loop will greatly enhance your Perl programming skills.