print factorial of a number in C

Program to Print Factorial of a Number in C

 There are lots of ways to print factorial of a number in C programming languages. I have listed down some common methods to print factorial of a number in C.

Ways to Print factorial of a Number

1. Factorial of Number using for Loop.
2. Factorial of a Number using While loop.
3. Factorial of a Number using do While loop.
4. Factorial of a Number using Recursion.
5. Factorial of a Number using Function call.

What is the Factorial of a Number in C?

Factorial of a number (N) is defined as the product of all numbers from 1 to N.Logic used in all the methods to print factorial of a number is that we will input a number from the user and then multiplying all numbers by decreasing/increasing it until the loop reaches 1 or N. Above code is for only Positive numbers You can add an If else statement to check whether a number is positive or negative. If the number is negative then Output should be " Negative number's Factorial doesn't exist.

Find Factorial of a number using For loop in C

//@Courpedia

#include<stdio.h>

void main()

{

int i,factorial=1,n;

printf("enter the number\n");

scanf("%d",&n);

for(int i=1;i<=n;i++)

{

    factorial=factorial*i;

}

printf("%d", factorial);

}

Another way to find the factorial of a number using c 

//@Courpedia

#include<stdio.h>

void main()

{

int i,n,fact=1;

printf("enter the number\n");

scanf("%d",&n);

for(i=n;i>=1;i--)

{

    fact=fact*i;

}

printf("%d", fact);

}

Find Factorial of a number using While loop in C

//@Courpedia

#include<stdio.h>

void main()

{

int i,n,fact=1;

printf("enter the number\n");

scanf("%d",&n);

int temp=1;

while(temp<=n)

{

    fact=temp*fact;

    temp++;

}

printf("%d", fact);

}

Find Factorial of a number using Do While loop in C

//@Courpedia

#include<stdio.h>

void main()

{

int i,n,fact=1;

printf("enter the number\n");

scanf("%d",&n);

int temp=1;

do{

    fact=fact*temp;

    temp++;

}while(temp<=n);

printf("%d", fact);

}

Find Factorial of a Number using Recursion in C

Recursion means accessing the function itself in the same function.

//@courpedia

#include <stdio.h>

unsigned long fact(unsigned long int n)

{

    if (n == 0)

    {

        return 1;

    }

    else

    {

        return(n * fact(n - 1));

    }

}

int main(int argc, char *argv[])

{

    unsigned long  n = 0;

    unsigned temp = 0;

    printf("Enter the number ");

    scanf("%lu", &n);

        temp = fact(n);

        printf("  %d \n", temp);

    

    return 0;

}

Also Read -  C programming interview questions

Find Factorial of a number using Function in C

//courpedia

#include<stdio.h>

int fact(int);

void main()

{

    int n;

    printf("enter the number\n");

    scanf("%d",&n);

    int b=  fact(n);

    printf("%d", b);

    

}

int fact(int n)

{

    int result=1;

for(int i=1;i<=n;i++)

{

    result=result*i;

}

return result;

}

You can try your own logic to find factorial of a number In C Programming Langauge in various other ways.

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