A simple program that I wrote to ask the user to give a number and then the program will compute the factorial value of the given number using subroutine in Perl programming language.

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Sample Program Output

Program Listing

# factorial_subroutine.pl
# Author   : Jake R. Pomperada,MAED-IT,MIT
# Date     : April 8, 2020   Wednesday 6:56 AM
# Location : Bacolod City, Negros Occidental
# Email    : jakerpomperada@gmail.com
# Website  : http://www.jakerpomperada.com

sub Factorial {
  my ($n) = @_;
  return 1 if $n == 0;
  return Factorial($n-1) * $n;

sub  Start { 
    print("\tFactorial Solver Using Subroutine in Perl");
    print("\tGive a Number : ");
    # Calling the Subroutine Factorial
    $result = Factorial($a);
    printf("\tThe factorial value of %d is %d.",$a,$result); 
    print("\t\tEnd of Program");

# Calling the Subroutine to start running the program

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