130
In this example we show how to check if a number is positive, negative or zero in Java
Example
We take user input then use an if – else statement to check whether the number is less than, greater than or equal to 0.
import java.util.Scanner;
public class JavaApplication1
{
public static void main(String[] args)
{
Scanner reader = new Scanner(System.in);
System.out.print("Enter a number: ");
int number = reader.nextInt();
// true if number is less than 0
if (number < 0.0)
System.out.println(number + " is a negative number.");
// true if number is greater than 0
else if ( number > 0.0)
System.out.println(number + " is a positive number.");
// if both test expression is evaluated to false
else
System.out.println(number + " is 0.");
}
}
A few runs of this
run: Enter a number: -1 -1 is a negative number. run: Enter a number: 2 2 is a positive number. run: Enter a number: 0 0 is 0.