Operators Lab

Learning Goals

• Practice declaring and initializing variables in Java.
• Practice using different operators.

Introduction

In this lab, you are going to practice declaring and initializing variables while also practicing using various operators that you have learned in this section.

Fork and clone this repository. When you do, you will see a Lab.java file. This is where you will put all of your code. Note the comments in the file as well. This should provide a basic layout of where to put certain parts of your code.

Instructions

Each of the comments in the Lab.java file will represent a section from these instructions.

Testing Your Code

During each section, feel free to run the program as much as you want to ensure the output is what you expect. You may also run the program with the debugger to see the variables in the Java Visualizer. You could also use the browser based visualizer here as well.

Variables

In this section, declare and initialize the variables you will work with in this program.

• Declare a boolean variable called result.
• Declare an int variable called x.
• Declare and initialize an int variable called y to the value 2.
• Declare and initialize an int variable called z to the value 8.
• Declare and initialize a String variable called thanks to the value "Thank you for visiting, ".
• Declare and initialize a String variable called name to the value "Eric".

Run your program after you have finished declaring and initializing all variables in this section. This section produces no output as there are no print statements, but you should still make sure it runs and compiles without error.

Combine Strings Section

In this section, you will practice using the + operator to concatenate multiple String values.

• Declare and initialize a String variable called thanksName to combine the strings thanks and name together.
• Print out the variable thanksName to the console using System.out.println().
• The program should print Thank you for visiting, Eric when it executes the print line.
• Here is a visualization of memory and how everything should look come this section:

Arithmetic Operators Section

In this section, you will practice using various arithmetic operators on int data types.

• Initialize x to the sum of y and z.
  • Remember, at this point, x has been declared but not initialized.
• Print out the variable x to the console using System.out.println().
• Assign x to the quotient of z divided by y.
• Print out the variable x to the console.
• Assign x to the following expression:
  • Write the expression where z is multiplied with itself.
  • Take the product of the previous expression and mod it with y.
    • Hint: product % y.
• Print out the variable x to the console.
• In this section alone, the program should print:

10
4
0

Here is a visualization of memory and how everything should look come this section:

Relational Operators Section

In this section, you will practice using relational operators with int data types. Remember, the result of using relational operators is a boolean.

• Initialize result to check if x is less than or equal to y.
• Print out the variable result to the console using System.out.println().
• Assign result to check if y is not equal to z.
• Print out the variable result to the console.
• Assign result to check if z is less than x
• Print out the variable result to the console.
• In this section alone, the program should print:

true
true
false

Here is a visualization of memory and how everything should look come this section:

Compound Assignment Operators Section

In this section, you will practice using some compound assignment operators with int data types.

• Re-assign x to the value of 4.
• Use the addition compound assignment operator (+=) to re-assign x with the value of y added to x.
• Print out the variable x to the console using System.out.println().
• Use the decrement operator (--) to re-assign x to decrease its value by 1.
• Print out the variable x to the console.
• Use the multiplication compound assignment operator (*=) to re-assign x with the value of x times z.
• Print out the variable x to the console.
• In this section alone, the program should print:

6
5
40

Here is a visualization of memory and how everything should look come this section:

Expected Output

The expected output of the program should be:

Thank you for visiting, Eric
10
4
0
true
true
false
6
5
40