Code 1:

1. C code for factorial of a number

2. C program to find the factorial of a given number

3. Factorial program in c using while loop
4. Factorial program in c without using recursion

#include<stdio.h>

int main(){

  int i=1,f=1,num;

  printf("Enter a number: ");

  scanf("%d",&num);

  while(i<=num){

      f=f*i;

      i++;

  }

  printf("Factorial of %d is: %d",num,f);

  return 0;

}

Sample output:

Enter a number: 5

Factorial of 5 is: 120

Code 2:

1. Factorial program in c using for loop

2. Simple factorial program in c

3. C program to calculate factorial

#include<stdio.h>

int main(){

  int i,f=1,num;

  printf("Enter a number: ");

  scanf("%d",&num);

  for(i=1;i<=num;i++)

      f=f*i;

  printf("Factorial of %d is: %d",num,f);

  return 0;

}

Code 3:

1. Factorial program in c using pointers

2. How to calculate factorial in c

3. Factorial program in c language

#include<stdio.h>

void findFactorial(int,int *);

int main(){

  int i,factorial,num;

  printf("Enter a number: ");

  scanf("%d",&num);

  findFactorial(num,&factorial);

  printf("Factorial of %d is: %d",num,*factorial);

  return 0;

}

void findFactorial(int num,int *factorial){

    int i;

    *factorial =1;

    for(i=1;i<=num;i++)

      *factorial=*factorial*i;

}

Code 4:

1. Factorial program in c using function

2. C program to find factorial of a number

#include<stdio.h>

int findFactorial(int);

int main(){

  int i,factorial,num;

  printf("Enter a number: ");

  scanf("%d",&num);

  factorial = findFactorial(num);

  printf("Factorial of %d is: %d",num,factorial);

  return 0;

}

int findFactorial(int num){

    int i,f=1;

    for(i=1;i<=num;i++)

      f=f*i;

     return f;

}

Sample output:

Enter a number: 8

Factorial of 8 is: 40320

Code 5:

1. Factorial series in c

#include<stdio.h>

int main(){

  long f=1;

  int i,num,min,max;

  printf("Enter the minimum range: ");

  scanf("%d",&min);

  printf("Enter the maximum range: ");

  scanf("%d",&max);

  printf("Factorial series in given range: ");

  for(num=min;num<=max;num++){

    f=1;

    for(i=1;i<=num;i++)

      f=f*i;

    printf("%ld ",f);

  }

  return 0;

}

Sample output:

Enter the minimum range: 1

Enter the maximum range: 10

Factorial series in given range: 1 2 6 24 120 720 5040 40320 362880 3628800

---

Algorithm:

Factorial value

Factorial of number is defined as:

Factorial (n) = 1*2*3 … * n

For example: Factorial of 5 = 1*2*3*4*5 = 120

Note: Factorial of zero = 1