Factorial program in C programming language: Three methods to find factorial, using a for loop, using recursion and by creating a function. Factorial is represented using '!', so five factorial will be written as (5!), n factorial as (n!). Also, n! = n*(n-1)*(n-2)*(n-3)...3.2.1 and zero factorial is defined as one i.e., 0! = 1.
//Find Factorial of a number
#include<stdio.h>
int main()
{
int i, n, fact = 1;
printf("Enter a number to calculate its factorial:\n");
scanf("%d", &n);
for (i = 1; i <= n; i++)
fact = fact * i;
printf("Factorial of %d = %d\n", n, fact);
return 0;
}
Enter a number to calculate its factorial:
5
Factorial of 5 = 120