How Can I Evaluate Arithmetic Expressions from Strings in C ?

Expression Evaluation in C

Evaluating arithmetic expressions directly from a string can be a useful task in various programming scenarios. Let's explore how to evaluate a simple expression with only , *, (, and ) operators, where * has higher precedence than .

Solution Using External Library

One convenient approach is to utilize an external library like ExprTk (http://partow.net/programming/exprtk/index.html). Here are some key benefits of using ExprTk:

• Simplicity: Expression evaluation can be done with a single include ("exprtk.hpp").
• Dynamic Variables: Variables can be changed dynamically during expression evaluation.
• Example Code: The library provides a concise example (http://partow.net/programming/exprtk/code/exprtk_simple_example_01.cpp) to get you started.

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