练习8.1:
#include <iostream>
#include <stdexcept>
using namespace std;istream &f(istream &in) {int v;while (in >> v, !in.eof()) {if (in.bad())throw runtime_error("IO流错误");if (in.fail()) {cerr << "数据错误，请重试:" << endl;in.clear();in.ignore(100, '\n');continue;}cout << v << endl;}in.clear();return in;
}int main() {cout << "请输入一些整数，按Ctrl+Z结束" << endl;f(cin);return 0;
}
练习8.2:
练习8.3:
遇到了文件结束符，或者遇到了IO流错误，或者读入了无效数据。
)
