2.1 1 to 10
Write a method that prints the numbers 1 to 10
2.1.1 Example
1: oneToTen() 2: *** Output *** 3: 1 4: 2 5: 3 6: 4 7: 5 8: 6 9: 7 10: 8 11: 9 12: 10
2.2 Odd Numbers
Write a method that prints the positive odd numbers less than 20
2.2.1 Example
1: oddNumbers() 2: *** Output *** 3: 1 4: 3 5: 5 6: 7 7: 9 8: 11 9: 13 10: 15 11: 17 12: 19
2.3 Square Numbers
Write a method that prints the square numbers up to 100
2.3.1 Example
1: squares() 2: *** Output *** 3: 1 4: 4 5: 9 6: 16 7: 25 8: 36 9: 49 10: 64 11: 81 12: 100
2.4 Random Numbers
Write a for loop to print out four random integers between 1 and 10
2.4.1 Example
1: random4() 2: *** Output *** 3: 3 4: 5 5: 2 6: 8
2.5 Even Numbers < n
Write a method to print out the positive even numbers less than n
2.5.1 Example
1: even(20) 2: *** Output *** 3: 2 4: 4 5: 6 6: 8 7: 10 8: 12 9: 14 10: 16 11: 18
2.6 Powers of 2
Write a method to print out the powers of 2 from 21 up to 2n
2.6.1 Example
1: powers(8) 2: *** Output *** 3: 2 4: 4 5: 8 6: 16 7: 32 8: 64 9: 128 10: 256
2.7 Are we there yet?
Write a program that outputs “Are we there yet?” and then waits for input. If the input is “Yes” the program outputs “Good!” and exits, otherwise the program loops.
2.7.1 Example
1: "Are we there yet?" 2: No 3: "Are we there yet?" 4: Spoons 5: "Are we there yet?" 6: Yes 7: Good!
2.8 Triangle
Write a method that uses nested loops to produce the following pattern
1: triangle() 2: *** Output *** 3: * 4: ** 5: *** 6: **** 7: *****
2.9 Table Square
Write a method that prints out a 4 x 4 table square
2.9.1 Example
1: tableSquare() 2: *** Output *** 3: A 4 x 4 table square 4: | 1 | 2 | 3 | 4 | 5: | 1 | 2 | 3 | 4 | 6: | 2 | 4 | 6 | 8 | 7: | 3 | 6 | 9 | 12 | 8: | 4 | 8 | 12 | 16 |
2.10 Table Squares
Extend your answer to the last question produce a method that will print out a n x n table square
2.10.1 Example
1: tableSquares(6) 2: *** Output *** 3: A 6 x 6 table square 4: | 1 | 2 | 3 | 4 | 5 | 6 | 5: | 2 | 4 | 6 | 8 | 10 | 12 | 6: | 3 | 6 | 9 | 12 | 15 | 18 | 7: | 4 | 8 | 12 | 16 | 20 | 24 | 8: | 5 | 10 | 15 | 20 | 25 | 30 | 9: | 6 | 12 | 18 | 24 | 30 | 36 |
Tony Ballantyne Tech 
I read that as “Two Loops”.. and not “2: Loops”
Thought it was an exercise in writing two concurrent loops (maybe using Threads).. I was quite impressed for a second.
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Ooh! Good point, I’ll change that. Threads come later… Any other feedback gratefully received!
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Great Exercise for practising loops! It’s good to check you can still do the basics.
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above exercises are also good for practicing streams
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Example 2.7.1 is the only one to break with the “write a method…*** Output ***” pattern. Not sure if this is intended.
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