Algorithm help on converting infix expression to postfix

This is a discussion on Algorithm help on converting infix expression to postfix within the C Programming forums, part of the General Programming Boards category; I found numerous examples on converting infix expression to postfix expression but my program needs to include some functions like ...

  1. #1
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    Algorithm help on converting infix expression to postfix

    I found numerous examples on converting infix expression to postfix expression but my program needs to include some functions like sqrt(x), min/max(x,y), fact(x), abs(x).

    abs(‐5) is converted to ‐5 abs
    120 (45+3) is converted to 120 45 3 + ‐
    (3^2 + 4^5)*fact(3) is converted to 3 2 ^ 4 5 ^ + 3 fact *
    min(3‐(4‐7) , (2+4)/3) is converted to 3 4 7 ‐ ‐ 2 4 + 3 / min

    I'm confused about what the precedence of those functions needs to be.

    Thanks for your input!

  2. #2
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    Precedence is not a problem. Read up on Reverse Polish Notation on Wikipedia. Using a small array as a first in, last out stack, it all comes up roses.

  3. #3
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    Take a look at shunting yard algorithm.

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