Data Types and Variables

Directions: Create a new folder named 09_10_variables inside your homework directory in your assignments repository: .../APCSA1/apcsa-assignments-fall-YourUsername/homework/09_10_variables

Inside this folder, write the following programs:

1. Write a Java program (Temperature.java) to convert temperature from Fahrenheit to Celsius degrees. You must use variables.

Output:

50.0 degrees Fahrenheit is equal to 10.0 Celsius

2. Write a Java program (Calculator.java) that calculates the sum of two numbers (int or double). You must use variables.

Output:

10 + 12 = 22

3. Create a file TrickyCalc.java and copy the following code inside. Run the program. Create a file answers.txt or answers.md and respond to the following questions:

• What do you notice about the mySum value?
• What is the value of checkResult, and why do we get that result?

public class TrickyCalc{
   public static void main(String[] args){
       double mySum = 0.1 + 0.1 + 0.1;
       double tmp = 0.3;
       boolean checkResult = mySum == tmp;

       System.out.println("0.1 + 0.1 + 0.1 = " + mySum);
       System.out.println(mySum + " == " + tmp + " is " + checkResult);
   }
}

4. Don’t forget to add your new files to Git, then commit and push your changes. After that, go to GitHub and verify that your files are there. I will not accept any excuses tomorrow if your homework is missing.

5. Double check that your files are organized like this in your repo:

apcsa-assignments-YourUsername
  classwork
    09_09_hello_world
      HelloWorld.java
  homework
    09_09_welcome
      Welcome.java
    09_10_variables
      Temperature.java
      Calculator.java
      TrickyCalc.java
      answers.txt or answers.md