## Problem

Write a program in C programming language to find the factorial of a given number and display it on the screen.

## How to find the factorial of a Number in C?

The factorial of a number is generally specified as follows

N! = 1*2*3*4… N

This applies only for the positive number. The factorial of 0 is considered to be 1.

Here’s a program in C demonstrating the factorial of a number.

#include <stdio.h> int main() { printf("Abundantcode.com coding samples\n"); int N,index ; long factorial = 1; printf("Enter a positive integer: "); scanf("%d",&N); if (N < 0) printf("Invalid number"); else { for(index=1; index<=N; ++index) { factorial *= index; } printf("Factorial of %d = %llu", N, factorial); } return 0; }

### Output

Abundantcode.com coding samples

Enter a positive integer: 4

Factorial of 4 = 24