Java: Check the number is negative, zero, or positive

Java Conditional Statement: Exercise-27 with Solution

Write a Java program that reads an integer and check whether it is negative, zero, or positive.

Test Data
Input a number: 7

Pictorial Presentation:

Java conditional statement Exercises: Check the number is negative, zero, or positive

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise27 {
 public static void main(String[] args)
        Scanner in = new Scanner(System.in);
        System.out.print("Input a number: ");
        int n = in.nextInt();

        if (n > 0)
            System.out.println("Number is positive");
        else if (n < 0)
            System.out.println("Number is negative");
            System.out.println("Number is zero");

Sample Output:

Input a number: 7                                                                                             
Number is positive


Flowchart: Java Conditional Statement Exercises - Check the number is negative, zero, or positive

Java Code Editor:

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Next: Write a Java program that reads a floating-point number. If the number is zero it prints "zero", otherwise, print "positive" or "negative". Add "small" if the absolute value of the number is less than 1, or "large" if it exceeds 1,000,000.

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Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);

Ref: https://bit.ly/3sA5d4I


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