# Factorial Solver Using Subroutine in Perl

Apr 8, 2020

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.

I am currently accepting programming work inventory system, enrollment system, accounting system, payroll system, information system, website design and development using WordPress, IT projects, school and application development, programming projects, thesis, and capstone projects, IT consulting work, computer tutorials, and web development work kindly contact me in the following email address for further details.  If you want to advertise on my website kindly contact me also in my email address also. Thank you.

My mobile number here in the Philippines is 09173084360.My telephone number at home here in Bacolod City, Negros Occidental Philippines is  +63 (034) 4335675.

Here in Bacolod City, Negros Occidental I also accepting computer repair, web development using WordPress, Computer Networking and Arduino Project development at a very affordable price.

I am also a book author you can purchase my books on computer programming and information technology in the following links below.

https://www.mindshaperspublishing.com/

https://www.unlimitedbooksph.com/

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

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();

``````