Calculadora

Calculator of combinated operations using integers.

Usage

The algorithm reads the input from the text file "proves.txt". You can use parenthesis () for priority, and the operators + - * / % ^ are available. Write your query expressions in a text file and execute the program. The algorithm will show the results in the standard output.

About the Calculator

The Calculator works in the same way as a compiler, as it has severals phases to treat an operation:

• Check that all symbols in the entrance file are correct
• Check that the parenthesys make sense, being the redundant parenthesis accepted by the algorithm.
• Check that the meaning of the operations is okay, having every symbol separated by another with a number.
• A recursive process starts, that digests the expression using recursivity. On every iteration:
  1. Parenthesis are deleted.
  2. The operation to calcule is selected.
  3. Due to recursion two things can happen:
  • One or two recursive calls are made to split the expression in smaller parts.
  • An operation of one single operator is done (e.g. 3+5 ), and the result is returned to the calling function, returning from the recursive call.

Examples of usage

(56*2+3)^2%2
2^(2+5)/2^2
5*4+1*4*6+(3*4+2*5*(4+2/1))
5*(4+2+3)*4*5+3*(2-2)
(((10+2)+5)+5)*(20-2)
(20-2)*(((10+2)+5)+5)
(3*(10+2))+((5+4)*(20-2))

• You can also use the calculator to check if an arithmeetical expression is correct.

Documentation

You can find more documentation in the coments of the C code and in the "Documentació" folder of the repository, in catalan.

Authors

• Aleix Mariné Tena - AleixMT
• Cristòfol Daudén Esmel - toful