condition number

troubled kid

Hello, how are u guys doing? great, I hope CFD, rock on!!

I'd just like to ask whether there are any available softwares/codes/solvers which calculates the condition number of a square matrix using the formula of

cond(A)=[highest eigenvalue/lowest eigenvalue]

Basically, if possible, i can write up a programme using C++ which enables the user to key in the matrix and, making use of the solver, churn out its condition number.

Thanks a lot!