Lab Test For Wednesday September 20, 2006

This lab test consists of three problems of increasing complexity. You should probably start at the top and work your way through. Keep an eye on the time as the test ends in 90 minutes. When submitted your assignment you must follow the instructions provided exactly.

(2 marks) Create a file called LabTest1A.java that contains exactly the following lines of test
```
import java.lang.*;
public class LabTest1A 
{
  public static void main(String[]  args) 
  {
    System.out.println("Life, don't talk to me about life.");
  }
}
```
Once you have completed the application and have tested to ensure it works correctly as specified, you can submit it using the submit command (described below in greater detail). You must submit this file using
```
submit 1020 lab1-wednesday LabTest1A.java
```
(e.g., LabTest1A.java) as many times as you like and in fact, you are encouraged to do so throughout the duration of the test. (You can learn more about the submit command by typing man submit).
You can verify that your submission has been accepted using
```
submit -l 1020 lab1-wednesday
```

(3 marks) The following code is supposed to output the area of a circle as a float (not double) given the value in radius. (The area of a circle is approximately 3.1415 * r * r.) Radius should have the value 4.0f. Correct the errors in the following. Note: The lines marked "keep" must not be changed.) You can obtain a copy of this file by clicking on this link and saving the file to disk.

import java.lang.*

public class  LabTest1B 
{
  public static void main(Strings[] args)
  {
    float radius;
    System.out.println("<<<<<<<<>>>>>>>>>>"); //keep
    radius = 4.0L;
    System.out.println("<<<<<<<<>>>>>>>>>>"); //keep
    float Radius = -6.0f;
    System.out.println("<<<<<<<<>>>>>>>>>>"); //keep
    int area = 3.1415 * Radius - Radius;
    System.out.println("<<<<<<<<>>>>>>>>>>"); //keep
    System.out.println(radius);
    System.out.println("<<<<<<<<>>>>>>>>>>"); //keep
  }
}

Submit your solution using

submit 1020 lab1-wednesday LabTest1B.java

(3 marks) Write a program that prints out the following two floating point computations, each on its own line. Each computation should be done as a float (not as a double). These two sums should be computed exactly as shown below
```
    sum1 =  100000002 + 0.1 - 100000002 - 0.1; 
    sum2 =  0.1 - 0.1 + 100000002 - 100000002;
```
If the values of sum1 and sum2 were 1 and -1 respectively, then your program should output
```
1
-1
```
Submit your solution using
```
submit 1020 lab1-wednesday LabTest1C.java
```

Once you have successfully submitted all three parts of the labtest, and checked that they have been submitted successfully, feel free to leave the test. Remember, once you log out any temporary work that you may have generated will be lost.