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Java Program to Display Factors of a Number

In this program, you'll learn to display all factors of a given number using for loop in Java.

To understand this example, you should have the knowledge of the following Java programming topics:


Example 1: Factors of a Positive Integer

public class Main {

  public static void main(String[] args) {

    // positive number
    int number = 60;

    System.out.print("Factors of " + number + " are: ");

    // loop runs from 1 to 60
    for (int i = 1; i <= number; ++i) {

      // if number is divided by i
      // i is the factor
      if (number % i == 0) {
        System.out.print(i + " ");
      }
    }
  }
}

Output

Factors of 60 are: 1 2 3 4 5 6 10 12 15 20 30 60

In the above program, number whose factors are to be found is stored in the variable number (60).

The for loop is iterated until i <= number is false. In each iteration, whether number is exactly divisible by i is checked (condition for i to be the factor of number) and the value of i is incremented by 1.


Example 2: Factors of Negative Number

class Main {

  public static void main(String[] args) {

    // negative number
    int number = -60;
    System.out.print("Factors of " + number + " are: ");

    // run loop from -60 to 60
    for(int i = number; i <= Math.abs(number); ++i) {

      // skips the iteration for i = 0
      if(i == 0) {
        continue;
      }
      else {
        if (number % i == 0) {
          System.out.print(i + " ");
        }
      }
    }
  }
}

Output

Factors of -60 are: -60 -30 -20 -15 -12 -10 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 10 12 15 20 30 60  

In the above example, we have calculated the factorial of a negative number. Here, the for loop runs from -60 to 60.

And, when the value of i is 0, the iteration is skipped. Otherwise, there will be an exception.

Note: The Math.abs() method returns the absolute value of the number.