11.从文件中读取文件一直到eof

#include"get.h"std::istream& get(std::istream& in){int ival;while(in >> ival, !in.eof()){if(in.bad())throw std::runtime_error("IO stream corrupted!");if(in.fail()){std::cerr << "bad data, try again!" << std::endl;in.clear();in.ignore(200, '\n');continue;}std::cout << "输入的数据：" << ival << std::endl;}in.clear();return in;}