solving linear equations with LAPACK/Matlab

Hi there,
I am solving linear equations with Matlab and now I need to use C++
instead. The size of the matrix is about 200x200 and is invertible. In
matlab, I solve the problem as follow

%Ax = b the system
x=inv(A)*b

(BTW, is it a right way to solve the system in matlab? Any better
routine for that problem?)

Anyway, for some reason, my tutor ask me to solve the same problem in
C++. So I am going to solve it with the help of LAPACK and the C++
wrapper (LAPACK++). However, I am very new to LAPACK and the
documentation seems not very friendly to user. I guess I should find
the routine to calculate the inverse of the matrix first and multiply
the inverse matrix with the vector on RHS (b). Would you please tell me
if I am doing right, any function in LAPACK for solving such system
directly ? Any example for solving tridiagonal system, five-diagonal
system and seven-diagonal system ?

Thanks in advance.

.

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