Expression Manipulator v0.2 (bug fixes, functions)

This is a discussion on Expression Manipulator v0.2 (bug fixes, functions) within the A Brief History of Cprogramming.com forums, part of the Community Boards category; Here's the source code. I'll upload an executable a short while later (in the morning, likely). New Features: - functions: ...

  1. #1
    Just because ygfperson's Avatar
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    Expression Manipulator v0.2 (bug fixes, functions)

    Here's the source code. I'll upload an executable a short while later (in the morning, likely).

    New Features:
    - functions: 6 constant trig functions, log functions, and any number of user-defined functions
    - new subtraction rules
    - all known bugs fixed

    Features:
    - 4 regular functions plus raising to a power
    - boundless limits on name sizes and recursion
    - simplification functions


    Usage:
    Code:
    sin(cos(0))*3+4(5-x)^3
    Output:
    Code:
    3*sin(cos(0)) + 4*[5 + -1*x]^3 = 3*sin(cos(0)) + 4*[5 + -1*x]^3
    
    3*sin(cos(0)) + 4*[5 + -1*x]^3 = 3*sin(cos(0)) + 4*[5 + -1*x]^3
    3*sin(cos(0)) + 500 + -300*x + 60*x^2 + -4*x^3 = 3*sin(cos(0)) + 500 + -300*x +
    60*x^2 + -4*x^3
    2.52441 + 500 + -300*x + 60*x^2 + -4*x^3 = 2.52441 + 500 + -300*x + 60*x^2 + -4*x^3
    6 trig functions:
    sin, cos, tan, cot, sec, csc
    2 log functions:
    log - base 10
    ln - base e

    f() is defined to be f(x) = x+y, although it could be any expression.
    Code:
    f(3)g(3)
    would become
    (3+y)*g(3)
    Comments? Questions? Suggestions? (Just fyi, terms aren't combined at the end, though nothing prevents them from being combined)
    Last edited by ygfperson; 05-26-2003 at 01:07 PM.

  2. #2
    Just because ygfperson's Avatar
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    Here's the executable, source code, and all:
    Attached Files Attached Files

  3. #3
    Code Goddess Prelude's Avatar
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    I take it you've removed the bugs you wanted me to look at?
    My best code is written with the delete key.

  4. #4
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    I keep trying to type in equations but it closes the window and there are no discernable results (what am I doing wrong? I tried typing expressions similar to the example you gave). I've been looking through the source, it looks really cool I wish I'd written it. Did it take ya a long time to write? What was this project for? Fun? School? Get laid?

  5. #5
    Just because ygfperson's Avatar
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    Originally posted by Prelude
    I take it you've removed the bugs you wanted me to look at?
    lol... yeah...

    Turns out I was using a reference where I should have used a local copy of the variable. My substitute function inputted a const reference to compare each copy in the vector with; but that reference was replaced during the for-loop, crashing the program.

    I keep trying to type in equations but it closes the window and there are no discernable results
    You need to run the program from a command prompt. Windows closes the window before you have a chance to see what the result was.
    I've been looking through the source, it looks really cool I wish I'd written it. Did it take ya a long time to write?
    Around 2 or 3 months... but I only worked on weekends and for a few hours at a time.
    What was this project for? Fun?
    Yes.
    School?
    No.
    Get laid?
    I wish.

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