Factorial Using Function Example Program In C++

Definition

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

6! = 6 x 5 x 4 x 3 x 2 x 1 = 720

The value of 0! is 1, according to the convention for an empty product.

Factorial Using Function Example Program

/*  Example Program For Factorial Value Using Function In C++
    little drops @ thiyagaraaj.com

    Coded By:THIYAGARAAJ MP             */

#include<iostream>
#include<conio.h>

using namespace std;

//Function
long factorial(int);

int main() {

    // Variable Declaration
    int counter, n;

    // Get Input Value
    cout << "Enter the Number :";
    cin>>n;

    // Factorial Function Call
    cout << n << " Factorial Value Is " << factorial(n);

    // Wait For Output Screen
    getch();
    return 0;
}

// Factorial Function

long factorial(int n) {
    int counter;
    long fact = 1;

    //for Loop Block
    for (int counter = 1; counter <= n; counter++) {
        fact = fact * counter;
    }

    return fact;
}

Sample Output

Enter the Number :6
6 Factorial Value Is 720