C Program – Find All Factors of a Natural Number - Divisor Listing

C Basics

Find All Factors of a Natural Number

The program finds and prints all positive factors of a given natural number. A factor divides the number without leaving a remainder. For example, factors of 12 are 1, 2, 3, 4, 6 and 12. We test each integer from 1 up to the number and print it if it divides evenly.

#include <stdio.h>
int main() {
    int n;
    printf("Enter a positive integer: ");
    scanf("%d", &n);
    printf("Factors of %d are: ", n);
    for (int i = 1; i <= n; i++) {
        if (n % i == 0) {
            printf("%d ", i);
        }
    }
    printf("\n");
    return 0;
}
Enter a positive integer: 12
Factors of 12 are: 1 2 3 4 6 12

Each integer from 1 to n is tested using the modulus operator. When n % i equals zero, i divides n exactly and is printed as a factor. This simple approach lists all divisors of the number.


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