[导入]C风格字符串与string类型

[导入]C风格字符串与string类型

C风格字符串等价于string 类型字符串字面值

string str1("Hello!"); //ok.

char *str2 = str1; //error.

char *str3 = str2.c_str(); //ok. but not quite.

//注意c_str()返回的数据类型是const char

const char *str4 = str2.c_str(); //ok.
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