在Turbo C环境下开发，实现对称矩阵的输入，并判定是否为正定。可以修改输入模块实现对任意非奇异矩阵求逆。求逆算法采用伴随矩阵法，求解行列式采用化上三角矩阵法。该算法系本人根据《线性代数》描述编写，矩阵的最大阶数可任意修改，更具有通用性。-in Turbo C development environment and achieve symmetric matrix input, and to determine whether the positive. Can modify the input module of arbitrary non-singular matrix inversion. Inverse algorithm adjoint matrix method, used to solve determinant of the upper triangular matrix. The algorithm is based on my "Linear Algebra" to describe the preparation, the biggest band Matrix will be able to arbitrarily amend, more versatile.