Algorithm

  1. Start
  2. Declare a variable to store the number.
  3. Read the number from the user or any other source.
  4. Check if the number is greater than 0.
    • If true, print "The number is positive."
    • If false, go to step 5.
  5. Check if the number is less than 0.
    • If true, print "The number is negative."
    • If false, print "The number is zero."
  6. End

 

Code Examples

#1 Code Example- Check if a Number is Positive or Negative using if else

Code - Java Programming

public class PositiveNegative {

    public static void main(String[] args) {

        double number = 12.3;

        // 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.");
    }
}
Copy The Code & Try With Live Editor

Output

x
–
+
cmd
12.3 is a positive number.
If you change the value of number to a negative number (say -12.3), the output will be:
-12.3 is a negative number.
Advertisements

Demonstration

Java Programing Example to Check Whether a Number is Positive or Negative-DevsEnv