Q:

Factorial Program in C

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robaa
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2022-11-13
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Factorial Program in C: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:

 

5! = 5*4*3*2*1 = 120  

3! = 3*2*1 = 6  

Here, 5! is pronounced as "5 factorial", it is also called "5 bang" or "5 shriek".

The factorial is normally used in Combinations and Permutations (mathematics).

There are many ways to write the factorial program in c language. Let's see the 2 ways to write the factorial program.

  • Factorial Program using loop
  • Factorial Program using recursion

Write a c program to print factorial of a number.

Input: 5

Output: 120

Input: 6

Output: 720

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robaa
2022-11-13
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Factorial Program using loop

Let's see the factorial Program using loop.

#include<stdio.h>  
int main()    
{    
 int i,fact=1,number;    
 printf("Enter a number: ");    
  scanf("%d",&number);    
    for(i=1;i<=number;i++){    
      fact=fact*i;    
  }    
  printf("Factorial of %d is: %d",number,fact);    
return 0;  
}

Output:

Enter a number: 5
Factorial of 5 is: 120

 

Factorial Program using recursion in C

Let's see the factorial program in c using recursion.

#include<stdio.h>  
  
long factorial(int n)  
{  
  if (n == 0)  
    return 1;  
  else  
    return(n * factorial(n-1));  
}  
   
void main()  
{  
  int number;  
  long fact;  
  printf("Enter a number: ");  
  scanf("%d", &number);   
   
  fact = factorial(number);  
  printf("Factorial of %d is %ld\n", number, fact);  
  return 0;  
}

Output:

Enter a number: 6
Factorial of 5 is: 720

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