雅克比迭代法用cpp实现，在数值计算中比较常用的一种方法-Jacobi iterative method using the cpp implementation, a method commonly used in the numerical calculation

改程序分别用Jacobi迭代法和G-S迭代法求解给出的方程组，并分别就记录达到所需精度的迭代次数。-Reform program were the Jacobi iteration and GS iterative method for solving equations given, respectively, on the record number of iterations to achieve the required accuracy.