C program displays number factors

Comprehensive Collection of C Programming Examples

In this example, you will learn to find all the factors of the integer entered by the user.

To understand this example, you should understand the followingC programmingTopic:

• C programming operators

• C if ... else statement

• C for loop

This program takes a positive integer from the user and displays all the positive factors of the number.

Find the factors of a positive integer

#include <stdio.h>
int main() {
　　　　int num, i;
　　　　printf("Enter a positive integer: ");
　　　　scanf("%d", &num);
　　　　printf("%d's factors: ", num);
　　　　for (i =　1; i <= num;　++i) {
　　　　　　　　if　(num　%　i　==　0)　{
　　　　　　　　　　　　printf("%d　",　i);
　　　　　　　　}
　　　　}
　　　　return 0;
}

Output result

Enter a positive integer:　60
6Factors of 0:　1　2　3　4　5　6　10　12　15　20　30　60

In the program, the positive integer entered by the user is stored in num.

Iterate the for loop until i <= num is false.

In each iteration, it checks whether the number can be divided by i. This is the condition for i to become a factor of num.

if　(num　%　i　==　0)　{
　　　　　　　　　　　　printf("%d　",　i);
}

Then, the value of i increases1.

Comprehensive Collection of C Programming Examples