Preview

• In class quiz covering Conditional logic and concepts from the previous week
• Learn about loops as another way to control the execution flow of a program.
• Introduction to methods.
• Interpret code to gain a better understanding of loops.
• Use Hackerrank to practice coding different types of loops.
• Complete a pair programming exercise and turn into Checkin.

• What does the following code print?

for(int i = 1; i < 12; i+=2)
    System.out.println(i);

• What does the following code print?

int j = 0;
while (j <= 8) {
    System.out.println(++j);
}

• What does the following code print?

for (int k = 7; k >= 0; k--);
    System.out.print(k + " ");
    // are you sure?

• What does the following code print?

for (int l = 0; l > 0; l++)
    System.out.println(l);

• What does the following code print?

int m = 0;
do {
    System.out.println(m);
    m--;
}
while (m > 0);

• Log into Hackerrank
• Complete the section named R3
• These practice problems will be open after this recitation as an additional resource.
• Remember, you can use the examples from this recitation and the lecture notes.

• Read all the steps carefully before beginning. Understand the larger picture.
• Create a new Java Project named R3, and make a class named R3.
• Copy the following code into the main method and follow the specifications:

  // Declare variables
  String restaurantName;
  String serverName;
  double subtotal;
  double tax;
  double total;
  double taxRate = 0.05;
  double tipRate1 = 0.10;
  double tipRate2 = 0.15;
  double tipRate3 = 0.20;
  		
  // Ask and receive input from the user
  
  		
  // Perform calculations
  
  
  // Change server's name to only be first name and to be uppercase
  
  		
  // Print receipt	
  System.out.println("=====================================");
  
  System.out.println("=====================================");
  
  System.out.println("=====================================");	
  

1. Instantiate and initialize a Scanner object.
   
   
2. Prompt the user for the name of the restaurant.
3. Read in the user's input to the variable restaurantName.
   • The restaurant can be be more than one word, like "Park Sushi".
4. Prompt the user for the name of the server.
5. Store the value in the variable serverName.
• The server's name can be either:
• A first name
• A first and a last name, separated by one space character.
6. Prompt the user for the cost of the bill.
7. Store the value in the variable subtotal.


8. Write a method to calculate the tax on the bill based on the subtotal and taxRate.
   • Where should I place other methods?
   • Here is the signature of the method:

       public static double computeTax(double amount, double rate) 

   
   
9. Call the method and store the result in the variable tax.


10. Calculate the total bill by adding the subtotal and tax together. Store the total bill in the variable total.
    
    
11. Write a method to calculate the suggested tip, based on the total and the tip rate.
• Here is the signature of the method:

    public static double computeTip(double amount, double rate) 



12. Using the calculated values you stored in variables, print a receipt to the console.
• Print the receipt one line at a time. You can use println() and printf() to do this.
• Only the server's first name should be printed! If the server only has a first name, this isn't a problem! But what about if the server provides and first and last name?
  This would be a good time to check out some String methods!
• You should make calls to the computeTip method for each of the three tip rates.

• NOTE: this does not include the prompts and input in steps 1-6 because you are allowed to customize your prompts.

=====================================
Park Sushi
Server: JULIE
Subtotal: $56.23
Tax: $2.81
=====================================
Total: $59.04

Suggested tips:
10%: $5.90
15%: $8.86
20%: $11.81

Thank you!
=====================================

• The restaurant is printed exactly how the user typed it.
• The server name is only the first name converted to all uppercase.
• There are spaces after every colon, except the line with "Suggested tips:".
• There are dollar signs before every money amount.
• All money amounts are formatted to exactly two decimal places.

• Displaying a percent sign using printf() requires typing % twice:

  	CODE: System.out.printf("My battery is only at 3%%.");
  
  	OUTPUT: My battery is only at 3%.
  	

• You can compute the suggested tips in advance and store them in variables, or you can compute them inside a print statement when printing the receipt.
• You may want to handle the printing of the server name last, since that's the harder part of this program.
• Ask lots of questions!
• Make sure your R3.java compiles and produces the correct output.
• Both team members must submit R3.java using the Checkin tab on the course website.