用c语言写的高斯消元法程序 Gauss-Seidel迭代算法程序 牛顿迭代算法程序 复化梯形公式算法程序 复化Simpson公式算法程序等-Written by c language program Gaussian elimination method Gauss-Seidel iteration algorithm Newton iterative algorithm complex algorithm trapezoid formula of complex algorithms proc