Question

Create a C++ Program that prompts the user to enter a number and compute for the factorial value.

SAMPLE OUTPUT:

ENTER A NUMBER: -5
zero & positive numbers only!!!

ENTER A NUMBER: 5
Factorial of 5 : 5*4*3*2*1 = 120

DO NOT USE FUNCTION FOR THIS PROBLEM. THANK YOU

  

Answer 1

//c++ program for factorial
#include<iostream>
using namespace std;
int main()
{
int n,i;
unsigned long long factorial = 1;
cout << "ENTER A NUMBER : ";
cin >> n;
if(n==0) //if n==0 printing 1
{
   cout << "Factorial of " << n << " = " << factorial;
}
else if(n>0)
   {
   for(i = 1; i<=n; ++i)   
   {
   factorial=factorial*i; //calculating factorial
   }
cout << "Factorial of " << n << " = " << factorial;   
   }
else
   cout<<"zero & positive numbers only!!!";
return 0;
}