Perl do-while Loop

Perl do while Loop

Unlike for and while loop, the do while loop checks its condition at the bottom of the loop. So do while loop will execute at least once.

The syntax of Perl language do-while loop is given below:

This is the simple program of Perl do while loop where we are printing the table of 1.

  $i = 1;  # do…while loop execution  do{     printf “$in”;     $i++;  }while( $i <= 10 );  

Output:

1  2  3  4  5  6  7  8  9  10

A nested do while loop is the one in which a do while loop is nested inside another do while loop.

It is executed completely for both inner and outer loops.

Example:

  $i = 1;  # do…while loop execution  do{     $j = 1;     do{     printf “$i $jn”;     $j++;  }while( $j <= 3 );  $i++;  }while( $i <= 3 );  

Output:

1 1  1 2  1 3  2 1  2 2  2 3  3 1  3 2  3 3

By passing true in while condition, infinite do while loop is executed. Its execution can be stopped by using ctrl + c.

Output:

Infinitive While Loop   Infinitive While Loop  Infinitive While Loop  Infinitive While Loop  Infinitive While Loop  ctrl+c

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