Simple library or implementation for a mathematical expression evaluator [closed]

Question

i have one text file that contains only one line the line only contains one math expression for example 12+(3.0*(4)-1)/sqrt(121)

my program needs to read this express as string and then give the result
13

is there any simple way or 3rd party dll/lib to make this out?

COMMENT ADDED:

Evaluating a string of simple mathematical expressions

here is the solution but many of the solutions only contain +-/* acturally ,i need the operators as many as possible such as ceiling square square root and power()

so this link maybe is the best solution
http://www.codeproject.com/KB/recipes/sota_expression_evaluator.aspx