Difference between revisions of "Control Structures Review Questions and Exercises"

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==Review Questions and Exercises==
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The solutions to these exercises can be found [[Control Structures Solutions|here]].
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===Review Questions===
 
===Review Questions===

Revision as of 15:40, 20 March 2007

COMP 1010 Home > Control Structures


Introduction

The solutions to these exercises can be found here.

   

{{{Body}}}

Review Questions

  1. Name the 3 different logical operators. What are the benefits of using logical operators?
  2. What is the proper way in Java to compare strings? Why?
  3. What are the results of the following logical operations?
    1. 'a' != 'b'
    2. (127-3*9) >= (97+8/4)
    3. "Hello" == "Hello"
  4. Write the truth table for the expression (X || Y) && Z


Exercises

1. Look at the code below. Clean it up so it uses the proper logical operators and proper use of if-else's. 

if (x == 1)
{
  if (y == 1)
  {
    if (!!!!true)
    {
      System.out.println("X and Y are 1!");
    }
  }
}
if (x == 2)
{
  System.out.println("X is 2!");
}
if (x < 1)
{
  System.out.println("X is under 1 or over 2!");
}
if (x > 2)
{
  System.out.println("X is under 1 or over 2!");
}


2. Is the result of the following statement true or false? 

String s1 = "test";
String s2 = "TEST";
String s3 = "test";

if (!(!(s1.equals(s2) && s1.equals(s3)) || s2.equals(s3)))
  System.out.println("The result is true");
else
  System.out.println("The result is false");

3. Write a program that will prompt a user to enter an integer. The program will determine whether the number is even or odd and print out the result. It will print out a different result if the number is negative. The program will continue until the user enters a 0. Also note that if the user enters a 0, the program will not print out anything other than that the program has finished.

4. Write a program that will prompt the user to enter a string. The program will print out whether or not the first character is a vowel or not.

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