Factorial program in c using for loop

#include <stdio.h>
 
long factorial(int);
 
int main()
{
  int number;

  long fact = 1;
 
  printf("Enter a number to calculate it's factorial\n");

  scanf("%d", &number);
 
  printf("%d! = %ld\n", number, factorial(number));
 
  return 0;
}
 
long factorial(int n)
{
  int c;

  long result = 1;
 
  for (c = 1; c <= n; c++)

    result = result * c;
 
  return result;
}