Factorial program in C

C code to find and print factorial of a number, three methods are given, first one uses for loop, second uses a function to find factorial and third using recursion. 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.

Factorial program in c using for loop

Here we find factorial using for loop.
int main()
  int c, n, fact = 1;
  printf("Enter a number to calculate it's factorial\n");
  scanf("%d", &n);
  for (c = 1; c <= n; c++)
    fact = fact * c;
  printf("Factorial of %d = %d\n", n, fact);
  return 0;

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