“神码”--重载运算符 高精度运算，加减乘除排列组合阶乘等

用STL实现简单运算表达式，其中包括加减乘除等，以输入等号为结束标志。-Simple arithmetic expressions, including addition, subtraction, etc., to enter an equal sign marks the end of the STL.

利用标准库算法和Vector容器编写的数组和矩阵的加减乘除四则运算-The use of the library algorithms and Vector container prepared array and matrix add, subtract, multiply and divide the four operations