MathOps.java Source code

Introduction

Here is the source code for MathOps.java

Source

//: c03:MathOps.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.util.*;

public class MathOps {

    // Shorthand to print a string and an int:

    static void printInt(String s, int i) {

        System.out.println(s + " = " + i);

    }

    // Shorthand to print a string and a float:

    static void printFloat(String s, float f) {

        System.out.println(s + " = " + f);

    }

    public static void main(String[] args) {
        // Create a random number generator,
        // seeds with current time by default:

        Random rand = new Random();

        int i, j, k;

        // Choose value from 1 to 100:

        j = rand.nextInt(100) + 1;

        k = rand.nextInt(100) + 1;

        printInt("j", j);
        printInt("k", k);

        i = j + k;
        printInt("j + k", i);

        i = j - k;
        printInt("j - k", i);

        i = k / j;
        printInt("k / j", i);

        i = k * j;
        printInt("k * j", i);

        i = k % j;
        printInt("k % j", i);

        j %= k;
        printInt("j %= k", j);

        // Floating-point number tests:

        float u, v, w; // applies to doubles, too

        v = rand.nextFloat();

        w = rand.nextFloat();

        printFloat("v", v);
        printFloat("w", w);

        u = v + w;
        printFloat("v + w", u);

        u = v - w;
        printFloat("v - w", u);

        u = v * w;
        printFloat("v * w", u);

        u = v / w;
        printFloat("v / w", u);

        // the following also works for

        // char, byte, short, int, long,

        // and double:

        u += v;
        printFloat("u += v", u);

        u -= v;
        printFloat("u -= v", u);

        u *= v;
        printFloat("u *= v", u);

        u /= v;
        printFloat("u /= v", u);

    }

} ///:~