CSCI 160 Problem 1

Example solution

import csbsju.cs160.*;

public class Question1 {
    public static void main(String[] args) {
        int num_even = 0;
        for(int i = 0; i < 5; i++) {
            IO.print("Number? ");
            int n = IO.readInt();
            if(n % 2 == 0) {
                num_even++;
            }
        }
        IO.println(num_even);
    }
}

Example test input

Number? -6
Number? 148
Number? 0
Number? 26
Number? 40
5

CSCI 160 Problem 2

Example solution

import csbsju.cs160.*;

public class Question2 {
    public static void main(String[] args) {
        double[] numbers = new double[5];
        double total = 0.0;
        for(int i = 0; i < numbers.length; i++) {
            IO.print("Number? ");
            numbers[i] = IO.readDouble();
            total = total + numbers[i];
        }
        IO.println(total);
        for(int i = numbers.length - 1; i >= 0; i--) {
            IO.println(numbers[i]);
        }
    }
}

Example test input

Number? -3.8
Number? 12e10
Number? -8e10
Number? -4e10
Number? 7.6
3.799996948242187
7.6
-4.0E10
-8.0E10
1.2E11
-3.8

CSCI 160 Problem 3

Example solution

import csbsju.cs160.*;

public class Question3 {
    public static void main(String[] args) {
        IO.print("Year?  ");
        int y1 = IO.readInt();
        IO.print("Month? ");
        int m1 = IO.readInt();
        IO.print("Day?   ");
        int d1 = IO.readInt();
        IO.println();

        IO.print("Year?  ");
        int y2 = IO.readInt();
        IO.print("Month? ");
        int m2 = IO.readInt();
        IO.print("Day?   ");
        int d2 = IO.readInt();

        Date start = new Date(y1, m1, d1);
        Date curr  = new Date(y1, m1, d1);
        Date end   = new Date(y2, m2, d2);

        int count = 0;
        while(!curr.equals(end)) {
            curr.increment(1);
            count++;
        }

        IO.println(count + " days between " + start.toString()
            + " and " + end.toString());
    }
}

Example test input

Year?  2002
Month? 0
Day?   1

Year?  2002
Month? 0
Day?   1

0 days between 1 Jan 2002 and 1 Jan 2002

CSCI 160 Problem 4

Example solution

import csbsju.cs160.*;

public class Rectangle {
    private int left;
    private int top;
    private int width;
    private int height;

    public Rectangle(int in_left, int in_top, int in_width, int in_height) {
        left = in_left;
        top = in_top;
        width = in_width;
        height = in_height;
    }

    public boolean contains(int x, int y) {
        if(x >= left && x <= left + width && y > top &&
                y <= top + height) {
            return true;
        } else {
            return false;
        }
    }

    public int getArea() {
        return width * height;
    }

    public void grow(int amount) {
        left -= amount;
        top -= amount;
        width += 2 * amount;
        height += 2 * amount;
    }
}

Example test input

import csbsju.cs160.*;

public class RectangleTest2 {
    public static void main(String[] args) {
        Rectangle rect1 = new Rectangle(-2, -2, 4, 4);
        if(!rect1.contains(2, 2)) IO.println("fails 1");
        if(!rect1.contains(-2, 2)) IO.println("fails 2");
        if(rect1.contains(3, 0)) IO.println("fails 3");
        if(rect1.contains(0, 3)) IO.println("fails 4");

        Rectangle rect2 = new Rectangle(10, 10, 30, 30);
        rect2.grow(10);
        if(!rect2.contains(0, 40)) IO.println("fails 5");
        if(rect2.contains(-1, 50)) IO.println("fails 6");
        if(rect2.contains(0, 51)) IO.println("fails 7");

        if(rect1.contains(3, 3)) IO.println("fails 8");
        IO.println("done");
    }
}