Write a C Program to find the factorial of a number.

Question :  Write a C Program to find the factorial of a number.

/*

Write a C Program to find the factorial of a number.

*/

#include <stdio.h>

int main()

{

            int n, i;

            unsigned long long fact = 1;

            printf("Enter an integer: ");

            scanf("%d", &n);

            // shows error if the user enters a negative integer

            if (n < 0)

            {

                        printf("Error! Factorial of a negative number doesn't exist.");

            }

            else

{

                        for (i = 1; i <= n; ++i)

{

                         fact *= i;

                        }

             printf("Factorial of %d = %llu", n, fact);

            }

    return 0;

}

OUTPUT :

Enter an integer: 10

Factorial of 10 = 3628800

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