Loops Coding Practice (2.7-2.12)

Loops Coding Practice (2.7-2.12)

Each coding exercise has its own folder. Open its .java file and press Run to try it. Run Tests checks every graded exercise in this lesson at once.

Exercise 1

Rewrite the code so that it uses a for loop instead of a while loop to print out all the integers from 5 to 1 (inclusive).

Open the 01-looppractice1 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 2

Rewrite the code to use a while loop instead of a for loop to print out the numbers from 1 to 10 (inclusive).

Open the 02-looppractice2 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 3

Rewrite the code so that it uses a for loop instead of a while loop to print out all the integers from 5 to 15 (inclusive).

Open the 03-looppractice3 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 4

Rewrite the code to use a while loop instead of a for loop to print out the numbers from 10 to 100 by 10’s (inclusive).

Open the 04-looppractice4 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 5

The code should print the values from 1 to 10 (inclusive) but has errors. Fix the errors so that the code works as intended. If the code is in an infinite loop you can press Ctrl+C in the terminal to stop the loop.

Open the 05-looppractice5 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 6

The code should print the values from 10 to 5, but it has errors. Fix the errors so that the code works as intended.

Open the 06-looppractice6 folder and edit Test1.java. Press Run to try it; Run Tests checks it (1 test).

Exercise 7

The code should print the values from 10 to 1, but it has errors. Fix the errors so that the code works as intended.

Open the 07-looppractice7 folder and edit Test1.java. Press Run to try it; Run Tests checks it (1 test).

Exercise 8

Finish the code to print a countdown from 100 to 0 by 10’s using a for or while loop.

Open the 08-looppractice8 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 9

Finish the code to print the value of x and " is even" if x is even and " is odd" if it is odd for all values from 10 to 1.

Open the 09-looppractice9 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 10

Finish the code to print the values for 10 * x where x changes from 0 to 10 using a loop.

Open the 10-looppractice10 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 11

Finish the code so that it prints a string message minus the last character each time through the loop until there are no more characters in message.

Open the 11-looppractice11 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 12

Finish the code to loop printing the message each time through the loop and remove an x from the message until all the x’s are gone.

Open the 12-looppractice12 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 13

Write a loop below to print the number of x’s in the string message. Use the substring method.

Open the 13-looppractice13 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 14

Write the code to print a rectangle of stars (*) with 5 rows of stars and 3 stars per row. Hint: use nested for loops.

Open the 14-looppractice14 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 15

Write the code to print a rectangle of stars (*) with 3 rows of stars and 5 stars per row.

Open the 15-looppractice15 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).

Exercise 16

Write the code to print 55555, 4444, 333, 22, 1 with each on a different line.

Open the 16-looppractice16 folder and edit Test1.java. Press Run to try it; Run Tests checks it (2 tests).