112标准跪对象cin 类 istream的定义 class istream: virtual public ios t public: istream(streambuf )i istream get(signed char *, int, char = \n; istream get(signed char x, int, char = \ni istream get(signed char &i istream get(unsigned char &i int geto; istream getline(signed char int, char =nD; istream getline unsigned char int, char =\n; istream read(signed char * int, )i int peek istream operator>>(signed char x istream operator >>(signed char &) istream operator >>(int &i11.2 标准流对象 cin 类istream的定义： class istream:virtual public ios { public: istream(streambuf *); istream & get(signed char *, int, char =‘\n’); istream & get(signed char *, int, char =‘\n’); istream & get(signed char &); istream & get(unsigned char &); int get(); istream & getline(signed char *, int, char =‘\n’); istream & getline(unsigned char *, int, char =‘\n’); istream & read(signed char *, int, ); …… int peek(); istream & operator >> (signed char *); istream & operator >> (signed char &); istream & operator >> (int &); …… };