Resolve Arithmetic operations

This is a discussion on Resolve Arithmetic operations within the C Programming forums, part of the General Programming Boards category; Hello, I am working on a Compiler and I've made it to the point it has to resolve arithmetic operations, ...

  1. #1
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    Resolve Arithmetic operations

    Hello, I am working on a Compiler and I've made it to the point it has to resolve arithmetic operations, however I would like to save some time and implementing some sort of already existing algorithm, I would like to ask if anyone knows an internet place or a book or has the link to somewher shere it is already done, please, this is to save time, so if anyone could tell me I would be thankful really.

    when I finish it, I can upload my code so some other people could see how it was done

    OK, Thanks in advance (i've already googled "postix notation resolve mathematic operations" but I found nothing)

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    ATH0 quzah's Avatar
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    Quote Originally Posted by louis_mine
    OK, Thanks in advance (i've already googled "postix notation resolve mathematic operations" but I found nothing)
    Try postfix instead. You could of course just go find the source code to another compiler and look at that.


    Quzah.
    Hope is the first step on the road to disappointment.

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    Just kidding.... fnoyan's Avatar
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    Maybe digging into EBNF and getting the logic may help you to solve the problems. BNF( and also EBNF) is one of the basic parts of compiler desing.

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    en.wikipedia.org/wiki/Reverse_Polish_notation

    There is also a section on the shunting yard algorithm, a simple method to convert traditional ("infix") mathematical expressions to postfix notation.
    Code:
    #include <stdio.h>
    
    void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){
    puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9
    /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i]
    ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][
    t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}

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