GCMathParser

GCMathParser is a free class that you can use in applications that need a way to deal with mathematical expressions input by the user.
GCMathParser accepts an NSString consisting of a well-formed mathematical expression, evaluates it, and returns the result. It supports arbitrary named variables, so it is also perfect for graph plotting applications.
Supported functions and operators:
- Basic operators: +, -, * (multiply) and / (divide)
- Mod operator: %
- Exponentiation operator: ^
- Negation: unary -
- Assignment: =
- Log functions: log(), log2(), ln(), exp()
- Transcendental functions: sin(), cos(), tan(), asin(), acos(), atan(), sinh(), cosh(), tanh(), asinh(), acosh(), atanh()
- Square root function: sqrt()
- Rounding functions: ceil(), floor(), round(), trunc(), rint(), near()
- Angular conversion functions: dtor(), rtod()
- Absolute value function: abs()
- Constants: pi

System requirements:
- Xcode