Unit 2: Practice

Coming soon

Table of Contents

1. Practice
   1. Grades
   2. Month
   3. Vote
   4. Zodiac
2. Challenges
   1. Intervals
   2. Pay Calculator

Practice

Grades

Scanner

if statements

boolean logic

Create a class called Grades which prompts the user for a test score. Depending on the score, print the letter grade received.

Example Output

Enter a test score: 85.23 [Enter ↩]
B

Template Code

public class Grades {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution

Month

Scanner

switch

Create a class called Month which prompts the user for a number from 1 to 12 Using a switch, print the month that corresponds with that number. If the number is not from 1 to 12, give an error message.

Example Output

Enter a number from 1 to 12: 11 [Enter ↩]
November

Template Code

public class Month {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution

Vote

Scanner

if statement

relational operators

Create a class called Vote which prompts the user for their age. Depending on their age, print to the console whether or not they can vote.

Example Output

Enter your age: 5 [Enter ↩]
Sorry, you can't vote yet.

Template Code

public class Vote {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution

Zodiac

Scanner

switch

modulus

Create a class called Zodiac which prompts the user for their birth year. Using a switch, print their zodiac sign. Hint: Zodiac signs repeat every 12 years.

Order of zodiac signs:

1. monkey
2. rooster
3. dog
4. pig
5. rat
6. ox
7. tiger
8. rabbit
9. dragon
10. snake
11. horse
12. sheep

Example Output

Enter your birth year: 2003 [Enter ↩]
sheep

Template Code

public class Zodiac {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution

Challenges

Intervals

Scanner

modulus

integer division

if statement

relational operators

Create a class called Intervals which prompts the user to enter start and end times for an earlier interval and a later interval in 24-hour format.

The program should then calculate the duration of each time interval and display:

• The duration of each interval
• Which interval is longer
• Whether the intervals of time overlap

Bonus points if you can implement a solution where if the user switches the start and end times and/or switches earlier and later intervals, the program will still function properly.

Hint: Use modulus and convert everything into minutes after midnight (00:00).

Note: You can use 2 consecutive calls to nextInt() to get 2 integers that are separated by a space.

Example Output

Enter earlier start and end times (in 24-hour format): 1200 1545 [Enter ↩]
Enter later start and end times (in 24-hour format): 1500 1732 [Enter ↩]
The earlier interval is 225 minutes long.
The later interval is 152 minutes long.
The earlier interval is longer.
The intervals overlap.

Template Code

public class Intervals {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution

Pay Calculator

Scanner

if statement

arithmetic operators

relational operators

print formatting

Create a class called PayCalculator which prompts the user to enter the number of hours worked that week and the hourly pay rate.

The program will compute the total pay for that week, paying time and a half for any hours over 40.

It should format the total pay in standard money form - that is, 2 decimal places of precision.

Hint: Time and a half means that if you work over 40 hours, your total will be the number of hours you worked _ pay rate, plus an overtime bonus. The overtime bonus is calculated by taking the number of hours overtime worked _ half the normal pay rate. (Hence, time and a half.)

Example Output 1

Enter number of hours: 23 [Enter ↩]
Enter pay rate per hour: $5.30 [Enter ↩]
Your total pay is $121.90.

Example Output 2

Enter number of hours: 45 [Enter ↩]
Enter pay rate per hour: $12.00 [Enter ↩]
Your total pay is $570.00.

Template Code

public class PayCalculator {
    public static void main(String[] args) {
        // write your code here
    }
}

Solution