C++ cin.clear()使用示例

#include <iostream>
#include <string>
using namespace std;
int main()
{
    int number;
    while (cout << "Enter a number : " && !(cin>>number))
    {
        cin.clear();
        string line;
        getline(cin, line);
        cout << "I am sorry, but '" << line << "' is not a number\n";
    }
    cout << "I got your number : " << number << endl;


    return 0;
}

#include <iostream>
#include <string>
using namespace std;
int main()
{
    int number;
    while (cout << "Enter a number : " && !(cin>>number))
    {
        cin.clear();
        char ch;
        do
        {
            cin.get(ch);
        } while(ch != '\n');
        cout << "Sorry Please enter a number : " << endl;
    }
    cout << "I got your number : " << number << endl;

    return 0;
}