Q. C++ Program to Find Factorial of a Given Number.

Here you will find an algorithm and program in C++ programming language to find factorial of a number. First let us understand what factorial means.

Explanation : The factorial of a number is the product of all the integers from 1 to that number.

For Example : Factorial of 5 is 120 i.e. 5*4*3*2*1

START
step 1 : Read the number n
step 2 : [Initialize]
         i=1, fact=1
step 3 : Repeat step 4 through 6 until i=n
step 4 : fact=fact*i
step 5 : i=i+1
step 6 : Print fact
STOP

C++ Program to Find Factorial of a Number

#include <iostream>
using namespace std;
int main()
{
  unsigned int num=7;
  unsigned long long factorial = 1;
  for(int i = 1; i <=num; ++i)
  {
    factorial *= i;
  }
  cout << "Factorial of " << num << " = " << factorial;    
  return 0;
}

Output

Factorial of 7 = 5040