C program to find the factorial of a number

Program code

#include <stdio.h>

#include <conio.h>

void main()

{

long int question, factorial=1, i;

clrscr();

printf(“Please input an integer to get its factorial.\n”);

scanf(“%ld”,&question);

for (i=question;i>=1;i--)

factorial=factorial*i;

printf(“The factorial of %ld is %ld.\n”,question,factorial);

getch(); 

}

Example of output

Please input an integer to get its factorial.

13

The factorial of 13 is 1932053504.