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To continue exploring your number base/number representation skills in implementing an multibase addition, subtraction, multiplication, division, or remainder table generating program.

Write a program that generates a table:

• argv[1] is the base specifier (2-36, default is 10)
• argv[2] is an optional upper bound (default is base-1)
• argv[3] is an optional lower bound (default is 1)
• using getenv(3), check for a variable named MTF1_OPER
  • if it exists, check it for the mathematical operation to perform, one of '+', '-', '*', '/', or '%'
  • if it doesn't exist, default to multiplication
  • if it exists and doesn't contain a valid symbol, display an error and exit

lab46:~/src/discrete/mtf1$ ./mtf1
       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.