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Java Exercises: Program to start with an integer n, divide n by 2 if n is even or multiply by 3 and add 1 if n is odd, repeat the process until n = 1

Java Basic: Exercise-86 with Solution

Write a Java program start with an integer n, divide n by 2 if n is even or multiply by 3 and add 1 if n is odd, repeat the process until n = 1.

Sample Solution:

Java Code:

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		System.out.println("Input the value of n: ");
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		while (n != 1) {
			if (n % 2 == 0) {
				n = n / 2;				
			}
			else {
				n = (3 * n + 1) / 2;				
			}
		}
		System.out.println("\nValue of n = "+n);
		in.close();
	}
}

If input 5

Sample Output:

Input the value of n: 
 9

Value of n = 1

Flowchart:

Flowchart: Java exercises: Program to start with an integer n, divide n by 2 if n is even or multiply by 3 and add 1 if n is odd, repeat the process until n = 1

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Java: Tips of the Day

countOccurrences

Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)
            .count();
}

Ref: https://bit.ly/3kCAgLb