为了方便字符串的输入, istream中还说明了几个主要用于输 入字符串的非格式化成员函数: istream& istream: getline(signed char, int, char =n) istream& istream: getline(unsigned char, int, char='In) istream& istream ignore(int =1, int EOF) int istream. gcounto为了方便字符串的输入，istream 中还说明了几个主要用于输 入字符串的非格式化成员函数： istream& istream :: getline(signed char*, int, char = '\n'); istream& istream :: getline(unsigned char*, int, char='\n'); istream& istream :: ignore(int = 1, int = EOF); int istream :: gcount();