Factorial a Number Using Function in C

 

Machine Problem

Write a program that uses a function that will ask the user to give a number and then the program will compute the factorial equivalent of the given number by the user.

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Program Listing

// factorial.cpp

// Author    : Mr. Jake R. Pomperada, BSCS,MAED-IT

// Date      : August 26, 2018   Sunday  5:19 PM

// Location  : Bacolod City, Negros Occidental Philippines.

// Website   : http://www.jakerpomperda.com

// Email     : jakerpomperada@jakerpomperada.com and jakerpomperada@gmail.com

#include <iostream>

#include <conio.h>

using namespace std;

 // function prototype declaration  

int factorial(int);  

int main()

{  

                

int num_input=0;

int solve=0;

cout <<"\n\n";

cout <<"\tFactorial a Number Solver";

cout <<"\n\n";

cout<<"\tGive a Number : ";

cin>>num_input;

solve= factorial(num_input);   

cout <<"\n\n";                                      

cout<<"\tThe factorial value of "<<num_input<<" is "<<solve<<".";

cout <<"\n\n";

cout << "\tEnd of Program";

cout <<"\n\n"; 

getch();

}

// function factorial

int factorial(int a)

{

int fact=1;

while(a>=1)

{

fact=fact*a;

a--;

}

return fact;

}