Factorial Solver Using Subroutine in Perl

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 { 

    $a=0;

    print("\n\n");

    print("\tFactorial Solver Using Subroutine in Perl");

    print("\n\n");

    print("\tGive a Number : ");

    chomp($a=<STDIN>);

    # Calling the Subroutine Factorial

    $result = Factorial($a);

     

    print("\n");

    printf("\tThe factorial value of %d is %d.",$a,$result); 

    print("\n\n");

    print("\t\tEnd of Program");

    print("\n");

  

 } 

# Calling the Subroutine to start running the program

Start();