Lab46 Wiki

If interested, I’ve thought up a bonus project you can undertake (it would be due the Wednesday of the first week of classes):

* Write a program that generates a multiplication table (project will be mtf0)

• argv[1] is an optional upper bound (default is 12)
• argv[2] is an optional lower bound (default is 1)

Example (default output):

lab46:~/src/discrete/mtf0$ ./mtf0
       1   2   3   4   5   6   7   8   9  10  11  12
   x------------------------------------------------
 1 |   1   2   3   4   5   6   7   8   9  10  11  12
 2 |   2   4   6   8  10  12  14  16  18  20  22  24
 3 |   3   6   9  12  15  18  21  24  27  30  33  36
 4 |   4   8  12  16  20  24  28  32  36  40  44  48
 5 |   5  10  15  20  25  30  35  40  45  50  55  60
 6 |   6  12  18  24  30  36  42  48  54  60  66  72
 7 |   7  14  21  28  35  42  49  56  63  70  77  84
 8 |   8  16  24  32  40  48  56  64  72  80  88  96
 9 |   9  18  27  36  45  54  63  72  81  90  99 108
10 |  10  20  30  40  50  60  70  80  90 100 110 120
11 |  11  22  33  44  55  66  77  88  99 110 121 132
12 |  12  24  36  48  60  72  84  96 108 120 132 144

I hope that renders correctly- note how everything is neatly aligned in its spaced column.

Altering the upper bound:

lab46:~/src/discrete/mtf0$ ./mtf0 6
     1  2  3  4  5  6
  x------------------
1 |  1  2  3  4  5  6
2 |  2  4  6  8 10 12
3 |  3  6  9 12 15 18
4 |  4  8 12 16 20 24
5 |  5 10 15 20 25 30
6 |  6 12 18 24 30 36

Another variation (customizing the upper, lower bounds):

lab46:~/src/discrete/mtf0$ ./mtf0 7 4
     4  5  6  7
  x------------
4 | 16 20 24 28
5 | 20 25 30 35
6 | 24 30 36 42
7 | 28 35 42 49

Spacing, formatting, and presentation are centrally important. I want those headers and headings, and dividing lines. Your output should match my output.

An issue you might run into is how much space will you have to allocate (you want it universal for the display of the entire table). For that, I say determine the length of the maximum value being output (ie the bottom-most right value). That value’s length should then influence all the other output in the table.