BasicData.java

BasicData.java

contents ::

  BasicData.java
  Line.java
  Point.java

/*
    Program to demonstrate basic Java data types
    Version 1.0
    Written by: STF
    (c) University of Otago, Dept. of Computer Science, 2001.

    Updated by James Little for Exercise 2 cosc241 8/3/01.
    And again for exercise 2 15/3/01.
*/

package jlittle_ex2;

import basicIO.*;
import java.text.*;
import java.io.*;

/**
* This is a Basic Data class... to increase my knowledge of basic (java) data type
*/
public class BasicData {

    public static void runTypeTests() {
        // integers
        byte largestByte = Byte.MAX_VALUE;
        byte smallestByte = Byte.MIN_VALUE;

        short largestShort = Short.MAX_VALUE;
         short smallestShort = Short.MIN_VALUE;

        int largestInteger = Integer.MAX_VALUE;
        int smallestInteger = Integer.MIN_VALUE;

        long largestLong = Long.MAX_VALUE;
        long smallestLong = Long.MIN_VALUE;

        // real numbers
        float largestFloat = Float.MAX_VALUE;
        float smallestFloat = Float.MIN_VALUE;

        double largestDouble = Double.MAX_VALUE;
        double smallestDouble = Double.MIN_VALUE;

        // display them all
        Out.println("Range of byte is from "
                    + smallestByte + " to " + largestByte);
        Out.println("Range of short is from "
                    + smallestShort + " to " + largestShort);
        Out.println("Range of int is from "
                    + smallestInteger + " to " + largestInteger);
        Out.println("Range of long is from "
                    + smallestLong + " to " + largestLong);
         Out.println("Range of float is from "
                         + smallestFloat + " to " + largestFloat);
         Out.println("Range of double is from "
                         + smallestDouble + " to " + largestDouble);
    } // end runTypeTests method

    /**
     * Run some tests using approximations to PI
     */
    public static void runPITests() {
        double circleRadius = 10.0;
        double circumference = 2*Math.PI*circleRadius;
        DecimalFormat df = new DecimalFormat("0.#");

        Out.println("Circumference of a circle with 10m radius is: "
                                   + df.format((circumference)) + " m.");
    } // end runPITests method

    /**
     * Run some tests with squares of numbers
     */
    public static void runSquareTests() {
        int x;                  // can't convert int to short, so I made x int.
        short y;                  // y can be short because its range is only <200
         short start = 150;
         int end = 200;

        for (y=start; y<end; y++) {
            x = y * y;                 // where x must go to 39601.. it cannot be short
            Out.println("The square of " + y + " is " + x);
        } // end for loop
    } // end runSquareTests method

    /**
     * Run some tests finding intersections between lines.
     * Refer to Line.java and Line.class documentation for details.
     */
    public static void runLineTests() {
        Line line1;
        Line line2;
        Line line3;
        Line line4;
        Point intersectPt;

        // line 1 is y=-x+4
        line1 = new Line(1, 1, -4);

        // line 2 is y=x+2
        line2 = new Line(-1, 1, -2);

        // line 3 is x=3
        line3 = new Line(-1, 0, 3);

        // line 4 is y=-x+1
        line4 = new Line(1, 1, -1);

                  intersectPt = new Point();

        // lines 1 and 2 should intersect
        if (line1.intersects(line2, intersectPt))
            Out.println("CORRECT: Intersection found at ("
                        + intersectPt.getX() + ", "
                        + intersectPt.getY() + ")");
        else
            Out.println("ERROR: No intersection found for lines 1 and 2");

        // lines 1 and 4 should not intersect (they are parallel)
        if (line1.intersects(line4, intersectPt))
            Out.println("ERROR: Intersection found for lines 1 and 4");
        else
            Out.println("CORRECT: No intersection found for lines 1 and 4");

        // vertical line 3 should intersect with line 2
        if (line3.intersects(line2, intersectPt))
            Out.println("CORRECT: Intersection found at ("
                        + intersectPt.getX() + ", "
                        + intersectPt.getY() + ")");
        else
            Out.println("ERROR: No intersection found for lines 3 and 2");

        // line 2 should intersect with line 4
        if (line2.intersects(line4, intersectPt))
            Out.println("CORRECT: Intersection found at ("
                        + intersectPt.getX() + ", "
                        + intersectPt.getY() + ")");
        else
            Out.println("ERROR: No intersection found for lines 2 and 4");
    } // end runLineTests method

    /**
     * Run some tests to illustrate Java data types and calculations
     */
    public static void main(String[] args) {
        runTypeTests();
        runPITests();
        runSquareTests();
        runLineTests();
        Out.println("END OF OUTPUT");
    } // end main method
} // end BasicData class

James Little