关于运算符重载的方法，学习C++的基础 你一定需要的-Operator overloading methods, you must need to learn the basis for C++

C预言师实现： 请编写一个程序计算表达式：data1 op data2的值。其中，op为运算符＋、－、*、/。-C prophecy teacher realized: Please write a program to calculate the expression: data1 op data2 value. Which, op as operators+,-,*, /.

a. C语言概述，C程序文件结构 b. 数据类型，运算符，表达式 c. 程序结构if, switCh, while等-a. C Language Overview, C program file structure b. data types, operators, expressions, c. program structure if, switCh, while, etc.