2: Loops

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 |

3 thoughts on “2: Loops”

  1. 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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