Factorial program in c

Factorial program in c using for loop







#include <stdio.h>
#include<conio.h>
void 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);
 
  getch();
}
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                                          OR


Factorial program in c using function

#include <stdio.h>
#inclued<conio.h>
long factorial(int);
 
void 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));
 
  getch();
}
 
long factorial(int n)
{
  int c;
  long result = 1;
 
  for (c = 1; c <= n; c++)
    result = result * c;
 
  return result;
}
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Factorial program in c using recursion







#include<stdio.h>

#include<conio.h>

long factorial(int);



void 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);

  }



getch();






long factorial(int n)

{

  if (n == 0)

    return 1;

  else

    return(n * factorial(n-1));

}