Determinant of a square matrix in C++

C++: 行列式の計算

メモ。

http://paulbourke.net/miscellaneous/determinant/
http://thira.plavox.info/blog/2008/06/_c.html
http://www.softwareandfinance.com/CPP/Matrix_Determinant.html
http://cboard.cprogramming.com/cplusplus-programming/30001-determinant-calculation.html