Assignment 2

In-Lab-Work

Part 1

1. Declare an integer n set to 1 (int n = 1).
2. Declare another integer m set to 10 (int m = 10).
3. Declare a float q set to 10 (float q = 10.0f).
4. Declare a float p set to 3.14f (float p = 3.14f).

1. This is the variable n 1; For this you can use the command:
   g.drawString("This is the variable n " + n, 50, 50);
2. This is m - n 9
3. This is the float p 3.14
4. This is n/m 0
5. This is n/q 0.1
6. This is 10 mod 3 1 (mod means the remainder of 10 divided by 3.

Part 2

1. This code gives the dimensions of your applet window (width and height), and places them in the integer variables w and h.
   int w = getSize().width;
   int h = getSize().height;
   Draw a vertical line which splits the screen exactly in half, using the variables w and h.

2. Convert 60 Fahrenheit degrees to Celsius. Use the following formula: Celsius = 5/9(Fahrenheit - 32).

Part 3

1. Find at least five compilation errors in the following code, so that after fixing them, the program "MyProgram.java" compiles succesfully.

   import java.applet.Applet;
   
   public class myfile extends Applet{
      public void paint(Graphic g){
          float p = 3.4;
          int n = 1
          g.drawString("This is 1+3.4 "+ n+p);
      }
   }
   

2. Define the variable int centerx = 300, int centery = 300. Use this variables to draw three circles with a common center. These variables refer to the upper left corner. The actual center is obtained from cenerx and centery by doing a simple calculation. The first circle should have radius equals to 20, the second 50, and the third 80.

Programming Assignment

First, you are given some code which gives this output. When you finish, your applet should look as similar as possible to this output. All questions should run in the same applet. For each question, it is required to use at least one variable.

1. Calculate
   1. 1+2+3+4+5+6+7+8+9+10.
   2. (1+2+3+4+5+6+7+8+9+10)/10.
   3. The area of the circle of radius 10.5. (The area of a circle is the product of pi*radius*radius, pi = 3.14).
2. Draw the rectangle whose upper right corner is the point (450, h/2+50), and whose lower left corner is the point (400, h/2+150), as its shown in the graph. (h is a variable defined in your code).
3. To the given representaion of the solar system,
   1. add the Earth's orbit.
   2. add the Earth.
   3. add the Moon's orbit.
   4. add the Moon.
   Note. Use only circles.
4. Swap the black square with the solar system (For this, modify the values of some variables).

Due date: midnight Nov 6th.