C++ 数字和字符串
添加数字和字符串
警告！
C++ 使用 + 运算符来进行 **加法** 和 **连接**。
数字会被加起来。字符串会被连接起来。
如果您添加两个数字，结果将是一个数字
如果您添加两个字符串，结果将是一个字符串连接
如果您尝试将一个数字添加到一个字符串中，将会出现错误
示例
string x = "10";
int y = 20;
string z = x + y;
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