C program to find all factors of a number

Write a C program to input a number from user and find all factors of the given number using for loop. How to find factors of a number in C program. Logic to find all factors of a given number in C programming.



Input number: 12


Factors of 12: 1, 2, 3, 4, 6, 12

Required knowledge

Basic C programming, If else, For loop

What is factor of a number?

Factor of any number is a whole number which exactly divides the number into a whole number without leaving any remainder. For example: 2 is a factor of 6 because 2 divides 6 exactly leaving no remainder.

Logic to find all factors of a number

Step by step descriptive logic to find all factors of a number.

  1. Input number from user. Store it in some variable say num.
  2. Run a loop from 1 to num, increment 1 in each iteration. The loop structure should look like for(i=1; i<=num; i++).
  3. For each iteration inside loop check current counter loop variable i is a factor of num or not. To check factor we check divisibility of number by performing modulo division i.e. if(num % i == 0) then i is a factor of num.

    If i is a factor of num then print the value of i.

Learn more - Program to find all prime factors of a number.

Program to find factors of any number

 * C program to print all factors of a number

#include <stdio.h>

int main()
    int i, num;

    /* Input number from user */
    printf("Enter any number to find its factor: ");
    scanf("%d", &num);

    printf("All factors of %d are: \n", num);

    /* Iterate from 1 to num */
    for(i=1; i<=num; i++)
         * If num is exactly divisible by i
         * Then i is a factor of num
        if(num % i == 0)
            printf("%d, ",i);

    return 0;


Enter any number to find its factors: 100

All factors of 100 are:
1, 2, 4, 5, 10, 20, 25, 50, 100,

Happy coding 😉

About Pankaj

Pankaj Prakash is the founder, editor and blogger at Codeforwin. He loves to learn new techs and write programming articles especially for beginners. He works at Vasudhaika Software Sols. as a Software Design Engineer and manages Codeforwin. In short Pankaj is Web developer, Blogger, Learner, Tech and Music lover.

Follow on: Twitter | Google | or

Comments and discussion
Have a doubt, write here. I will help my best.
Before commenting you must escape your source code before commenting. Paste your source code inside
<pre><code> ----Your Source Code---- </code></pre>