class String{
public:
friend istream& operator >>(istream& intput,const String& s);
private:
char* Cstr;
};
class String{
public:
friend istream& operator >>(istream& intput,const String& s);
private:
char* Cstr;
};
Cstr在使用前有没有申请内存空间?
Cstr在类中只声明了,但是没有申请内存空间
s.Cstr = new char[100];//100这个数根据实际需要来设置
input >> s.Cstr;