C Program to Read a number and print its Factorial

#include<stdio.h>
#include<conio.h>
int Factorial(int input);
void main()
{
       int fn, sn;

printf("Enter first number:");
scanf("%d", &fn);

printf("Enter second number:");
scanf("%d", &sn);

printf("Factorial of %d is %d", fn, Factorial(fn));
printf("Factorial of %d is %d", sn,Factorial(sn));

getch();
}
int Factorial(int input)
{
       int fact=1, i;
       for(i=1; i<= input; i++)
          fact= fact*i;
       return fact;
}

Here, first of all, we include the required header files stdio.h and conio.h and then we declare the main function and then we declare the integer variables fn and sn.

after that using the printf() function and scanf() function we ask for input by the user for both variables. and then using the Factorial function we print the factorial of both variables.