Trusted answers to developer questions
Trusted Answers to Developer Questions

Related Tags

positive
negative
java
number
communitycreator

How to check if a number is positive, negative, or zero in Java

okwudili onyejiaku

Overview

We can check if a value is positive, negative, or zero in Java using the conditional statements if else and else if. The logic is to check first if the number is greater than 0 (positive). The second condition is to check if it is less than zero (negative). The last condition is to say that it is a zero because none of the other conditions are true.

Syntax

if(number > 0)
    // number is positive
else if(number < 0)
    // number is negative
else
    // number is equal to zero
Syntax for checking if a number is positive, negative or zero in Java

Parameters

number: This is the number we want to check to see if it is positive, negative, or zero.

Example

class HelloWorld {
    static void checkNumber(int num){
      //check if number is positive, negative or zero
        if(num>0)
            System.out.println(num + " is POSITIVE NUMBER.");
        else if(num<0)
            System.out.println(num + " is NEGATIVE NUMBER.");
        else
            System.out.println(num + " is a ZERO.");
    }
    public static void main( String args[] ) {
        // create some number values
        int no1 = 20;
        int no2 = 0;
        int no3 = -100;
        int no4 = 4 * -1;

        // invoke function
        checkNumber(no1);
        checkNumber(no2);
        checkNumber(no3);
        checkNumber(no4);
    }
}
Check if a number is positive, negative, or zero in Java

Explanation

  • Line 2: We create a method called checkNumber() which takes a number as a parameter, checks if it is positive, negative, or zero, then tells us what it is.
  • Lines 13–16: We create some integer values that we want to check to see if they are positive, negative, or zero.
  • Lines 19–22: With the checkNumber() method we created, we use it to check if the numbers we created are positive, negative, or zero. Then we print the results to the console.

RELATED TAGS

positive
negative
java
number
communitycreator
RELATED COURSES

View all Courses

Keep Exploring