Mathematic Expression Parser

These are C codes for parsing any expression. For more detail, please look at the comment in the codes. The first version, express1.c, contains only a few functionality. The second version includes many mathematical functions.

Since there is a request for PASCAL, the PASCAL versions for express1 has been added.

• Name: Mathematic Expression Parser
• Last Updated: 10 April 1995
• Platform: Standard ANSI C or PASCAL
• Source Code:
  • express1.c ( 4,613 bytes)
  • express2.c ( 9,385 bytes)
  • express1.p ( 6,445 bytes): The PASCAL version of "express1.c" translated by Dmitry Dyachenko
  • express2.p ( 15,330 bytes): The PASCAL version of "express2.c", translated by Dmitry Dyachenko
• For More Information: Contact Kittiphan Techakittiroj
• Remark:
  • Adding variable support can be done by doing the same way as I did for the "PI" value in "express2.c". You should have an array to keep the value of your variables.
• Update:
  • 11 May 1998, Post the PASCAL version of "express2.c". "express2.p" is modified by Dmitry Dyachenko
  • 14 Feb 1998, Add the ability in "express2.c" to accept commas in numbers, e.g. "1,000"
  • 27 May 1997, Fix the bug when the expression is "2-2-2"
  • 17 May 1997, Get rid of the extra condtions in the example (function main)
  • 30 January 1997, Fix the bug in the unary '+' reported by robin@cybercomm.nl