MathClass.java

package com.example.mathclass;
public class MathClass {

    private static int a;

    // an example method to use as a guideline
    public void halve(double x) {
        System.out.println(x / 2);
    }

    // I'll give you the first method's outline to fill in. For the rest, you're in charge of
    // declaring the entire method.
    public void square(int x) {
        System.out.println(x * x);
    }

    // create your own methods here

    public void averageFive(double a, double b, double c, double d, double e) {
        System.out.println((a + b + c + d + e) / 5);
    }

    public void raiseToTheFourth(int x) {
        System.out.println(x * x * x * x);
    }

    public void setKey(int x) {
        a = x;
    }

    public void multiplyByKey(int x) {
        System.out.println(a * x);
    }

    public static void keyCubed() {
        System.out.println(a * a * a);
    }


    public static void makeInteger(double x) {
        System.out.println((int)x);
    }

    public static void roundToNearestWhole(double x) {
        System.out.println((int)(x+0.5) / 1);
    }

    public static void main(String args[]) {

        MathClass tester = new MathClass();

        // example method
        // output: 4
        tester.halve(8);

        // you are in charge of making the rest of these work

        // output: 49
        tester.square(7);

        // output: 7
        tester.averageFive(7,10,5,7,6);

        // output: 81
        tester.raiseToTheFourth(3);

        // output: nothing, just save the number 4 as an instance variable
        tester.setKey(4);

        // output: 28
        tester.multiplyByKey(7);

        // output: 64
        tester.keyCubed();

        // output: 3
        tester.makeInteger(3.756);

        // output: 8
        tester.roundToNearestWhole(7.8);
    }
}