CPSC 120 Pre-Lab Assignment: Lab #2

1. Write Java code to do each of the following:
   1. Set up storage for (that is, declare) an integer variable count without giving it an initial value.

      
      

   2. Set up storage for an integer variable count and give it an initial value of 0.

      
      

   3. Set count to 5, assuming that it has already been declared as an integer variable.

      
      

   4. Set count to one more than its current value, assuming that it has already been declared as an integer variable and currently has a value.

   
   

2. The following program reads three integers and prints the average. Fill in the blanks so that it will work correctly.

   // ********************************************************************
   // FILE: Average.java
   // Purpose: Read three integers from the user and print their average
   // ********************************************************************
   
   import __________________________________________;
   
   public class Average
   {
     public static void main(String[] args)
     {
       int val1, val2, val3;
       double average;
   
       // Create a Scanner object named scan
   
       __________________________________________________  ;
   
       // get three values from user
       System.out.println("Please enter three integers and " +
                          "I will compute their average");
   
       __________________________________________________  ;
   
       __________________________________________________  ;
   
       __________________________________________________  ;
   
       //compute the average
   
       __________________________________________________  ;
   
       //print the average
   
       ______________________________________________________ ;
     }
   }
   

   
   
3. What is the difference between a variable and a constant?

   
   
   
   

4. Given the declarations below, find the result of each expression.

   int a = 3, b = 10, c = 7;
   double w = 12.9, y = 3.2;
   
   a + b * c
   
    
   a - b - c
   
    
   a / b
   
    
   b / a
   
    
   a - b / c
   
    
   w / y
   
    
   y / w
   
    
   a + w / b
   
    
   a % b / y
   
    
   b % a
   
    
   w %  y