A library for

• dividing integers or rationals. It calculates intermidate steps when performing divisions. Supports negative numerals.
• Zapfenrechnung. A Zapfenrechnung (Zapfen rechnen) looks like this:

Stand-alone program

• sdivcon: Console program which accepts input from stdin like dividend:divisor and writes the results to stdout, displaying the intermediate steps when dividing the pen and paper method
• webzapfen: Web app to display a Zapfenrechnung, including the intermediate division steps

         27 * 2 = 54
         54 * 3 = 162
        162 * 4 = 648
        648 * 5 = 3240
       3240 * 6 = 19440
      19440 * 7 = 136080
     136080 * 8 = 1088640
    1088640 * 9 = 9797760
    9797760 / 2 = 4898880
    4898880 / 3 = 1632960
    1632960 / 4 = 408240
     408240 / 5 = 81648
      81648 / 6 = 13608
      13608 / 7 = 1944
       1944 / 8 = 243
        243 / 9 = 27

• Division: Arbitrary precision mathematics
• Division: Negative numbers & fractional numbers supported when deviding the pen & paper method
• Division: Intermediate steps are returned for display / control
• ZapfenRechnung: Arbitrary precision mathematics

Library:

go get github.com/the42/schoolcalc/schoolcalc

Programs:

Command line program sdivcon to display the intermediate results of SchoolDivide:

  go get github.com/the42/schoolcalc/sdivcon

Web application webzapfen displays a Zapfenrechnung, including the intermediate division steps

  go get github.com/the42/schoolcalc/webzapfen

SchoolDivide is covered by test cases. ZapfenRechnung contains a short executable main program in the comments to the library function.

The package is released under the Simplified BSD License See file "LICENSE"

To run the tests:

go test github.com/the42/schoolcalc