C Program to Find Factorial of a Number

C Program to Find Factorial of a Number

C program to find factorial of a number; Through this tutorial, we will learn how to find factorial of a number in c program using for loop, while loop, recursion and Function.

Algorithm of C Program for Factorial

Use the algorithm to write a program to find factorial of a number; as follows:

  • Start program
  • Ask the user to enter an integer to find the factorial
  • Read the integer and assign it to a variable
  • From the value of the integer up to 1, multiply each digit and update the final value
  • The final value at the end of all the multiplication till 1 is the factorial
  • End program

Programs to Find Factorial of a Number in C

  • C Program to find Factorial of a Number Using While Loop
  • C Program to find Factorial of a Number Using For Loop
  • C Program to find Factorial of a Number Using Recursion
  • C Program to find Factorial of a Number Using Function

C Program to find Factorial of a Number Using While Loop

#include<stdio.h>

int main(){

    int x=1,fact=1,n;

    printf("Enter a number to find factorial: ");

    scanf("%d",&n);

    while(x<=n){

        fact=fact*x;

        x++;

    } 

    printf("Factorial of %d is: %d",n,fact);

    return 0;

}

The output of the above c program; as follows:

Enter a number to find factorial: 5
Factorial of 5 is: 120

C Program to find Factorial of a Number Using For Loop

#include<stdio.h>

int main(){

    int x,fact=1,n;

    printf("Enter a number to find factorial: ");

    scanf("%d",&n); 

    for(x=1;x<=n;x++)

        fact=fact*x; 

    printf("Factorial of %d is: %d",n,fact);

    return 0;

}

The output of the above c program; as follows:

Enter a number to find factorial: 6
Factorial of 6 is: 720

C Program to find Factorial of a Number Using Recursion

#include <stdio.h>

int main(){

int n;

printf("Enter a number to find factorial: ");

scanf("%d",&n);

printf("The factorial of the number is %d", fact(n));

return 0;

}

// Recursive function to find factorial

int fact(int y){

if (y == 0)

return 1;

return y * fact(y - 1);

}

The output of the above c program; as follows:

Enter a number to find factorial: 9
The factorial of the number is 362880

C Program to find Factorial of a Number Using Pointer

#include <stdio.h>
 
int fact(int);
 
void main()
{
 int no,factorial;
 
  	printf("Enter a number to calculate it's factorial :- ");
  	scanf("%d",&no);
  	factorial=fact(no);
    printf("Factorial of the num(%d) = %d\n",no,factorial);
//printf("Factorial of the num(%d) = %d\n",no,fact(no));//another way of calling a function//comment above two lines if you want to use this
}
 
int fact(int n)
{
    int i,f=1;
    for(i=1;i<=n;i++)
    {
        f=f*i;
    }
    return f;
}

The output of the above c program; as follows:

Enter a number to calculate it's factorial :- 8
Factorial of the num(8) = 40320

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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