040 - Method Header Practice 5

Write a method header on line two with the following specs:

 

Returns: a double

Name: negate

Parameters: a double called "num"

 

Then, starting on line 4, write the code that will return the opposite value of num (if it's positive, make it negative, otherwise make it positive)

 

Examples:

• 4 ==> -4

• -10 ==> 10

• 1 ==> -1

---

Solution

import java.util.*;
class Main {
    public static double negate(double n)
    {
        return n-(n*2);
    }
    
    //test case below (dont change):
    public static void main(String[] args){
        System.out.println(negate(8)); //should be -8
        System.out.println(negate(-2)); //should be 2
    }
}