Find Factors of a Number in Java using While loop | For | Recursion | Functions

Find factors of a number in java using while loop, for loop, recursion, and functions.

In this article, you will learn how to find factors of a number in java using while loop, for loop, recursion, and functions.

 

Example-1

 

Example-2

 

What are the factors of a number?

The factors of a number are defined as numbers that divided the original number without leaving any remainder (left reminder = 0).

 

You should have knowledge of the following topics in java programming to understand these programs:

• Java java.util.Scanner package
• Java main() method
• Java for loop statement
• Java while loop statement
• Java System.out.println() function
• Java Functions
• Java Recursion

 

In this article, we solve this problem in four methods:

1. Using the while loop
2. Using the for loop
3. Using the functions
4. Using the recursion

 

Java Program to Find Factors of a Number using While loop

// Java Program to Find Factors of a Number using While loop
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int x, i = 1;

        System.out.println("-----Enter the positive integer number-----");
        x = in.nextInt();

        System.out.print("\nThe factors of the " + x + " are: ");
        while (i <= x) {
            if (x % i == 0) {
                System.out.print(i + " ");
            }
            ++i;
        }
        System.out.print("\n");
    }
}

Run Program

Output

 

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Java Program to Find Factors of a Number using For loop

// Java Program to Find Factors of a Number using For loop
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int x, i;

        System.out.println("-----Enter the positive integer number-----");
        x = in.nextInt();

        System.out.print("\nThe factors of the " + x + " are: ");
        for (i = 1; i <= x; ++i) {
            if (x % i == 0) {
                System.out.print(i + " ");
            }
            ++i;
        }
        System.out.print("\n");
    }
}

Run Program

 

Explanation

In these given programs, we have taken input 75 a random number then applied the while loop and makes a calculation on this random number.

With Itself reminder zero to find the possible factors of this random number.

The same calculation applied to the second program with for loop.

 

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Java Program to Find Factors of a Number using Functions

// Java Program to Find Factors of a Number using Functions
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        System.out.println("-----Enter the positive integer number-----");
        int x = in.nextInt();

        FindFactors(x);
    }

    // This function will return the factors of input number
    public static void FindFactors(int x) {
        int i = 1;
        
        System.out.print("\nThe factors of the " + x + " are: ");
        while (i <= x) {
            if (x % i == 0) {
                System.out.print(i + " ");
            }
            ++i;
        }
        System.out.print("\n");
    }
}

Run Program

Output

 

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Java Program to Find Factors of a Number using Recursion

// Java Program to Find Factors of a Number using Recursion
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        System.out.println("-----Enter the positive integer number-----");
        int x = in.nextInt();

        System.out.print("\nThe factors of the " + x + " are: ");
        FindFactors(x, 1);
        System.out.print("\n");
    }

    // This function will return the factors of input number
    // Using the recursion
    public static void FindFactors(int x, int i) {
        // It will check if the number is less than
        if (i <= x) {
            if (x % i == 0) {
                System.out.print(i + " ");
            }
            
            // It will call the function recursively
            // To print the next number
            FindFactors(x, i + 1);
        }
    }
}

Run Program

 

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