47 : C Program to find factorial of a number

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What is factorial of a number ?

It is a product of an int and all the integers below it,

Example 5! = 5 x 4 x 3 x 2 x 1 ! = 120

Logic : 


  for (i = 1; i <= number ; i++) {
   
      factorial = factorial * i;    
      
  }


Variables :

number : Datatype int : Holds value of year inputted by the user. %d is the Format specifier for int's

i : Datatype int : variable used in for loop

unsigned : Datatype long : To hold result. As factorial cannot be negative we set it as unsigned 








*
 * 1000+ C programs + tutorials
 *
 * 
 * 47_Calculate_factorial_of_a_number_C_program.c
 *
 *
 *  Created on: Oct 20, 2014
 *  Author: Code2care.org
 */

#include 
//#include 



void main() {

int number;
int i;
unsigned long factorial = 1;
  

//clrscr();

    printf("C Program Calculate Factorial of entered number.");

    printf("\n\n Enter Number : ");
    scanf("%i", &number);

    

     
     
  //Logic factorial

  for (i = 1; i <= number ; i++) {
      factorial = factorial * i;    
  }
  
  printf("\n\n %d! = %lu",number,factorial);
    
   
  

//getch();



}








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