11_18.cpp

10个比较经典的C++程序。初学者就先多学习学习别人吧。

#include <iostream>
using namespace std;
int main()
{  int integerValue;
   cout << "Before a bad input operation:" //显示cin流错误状态
        << "\ncin.rdstate(): " << cin.rdstate() << "\n    cin.eof(): " << cin.eof()
        << "\t   cin.fail(): " << cin.fail() << "\n    cin.bad(): " << cin.bad()
        << "\t   cin.good(): " << cin.good()
        << "\nExpects an integer, but enter a character: ";
   cin >> integerValue; 
   cout << "After a bad input operation:"  //错误输入后，显示流cin错误状态
        << "\ncin.rdstate(): " << cin.rdstate()  << "\n    cin.eof(): " << cin.eof()
        << "\t   cin.fail(): " << cin.fail()  << "\n    cin.bad(): " << cin.bad()
        << "\t   cin.good(): " << cin.good() << endl;
   cin.clear(); 						//清除流
   cout << "After cin.clear()"			//清除流后显示流错误状态
        << "\ncin.fail(): " << cin.fail()<< "; cin.good(): " << cin.good() << endl;
   return 0;
}