Factorial program in c using for loop

Factorial program in c using for loop

#include <stdio.h>

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;

}

Output of program:

Enter a number to calculate it's factorial

6

Factorial of %d =720

Factorial program in c using function

#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;

}

Factorial program in c using recursion

#include<stdio.h>

long factorial(int);

int main()

{

  int n;

  long f;

  printf("Enter an integer to find factorial\n");

  scanf("%d", &n);

  if (n < 0)

    printf("Negative integers are not allowed.\n");

  else

  {

    f = factorial(n);

    printf("%d! = %ld\n", n, f);

  }

  return 0;

}

long factorial(int n)

{

  if (n == 0)

    return 1;

  else

    return(n * factorial(n-1));

}

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