如何验证用户输入的数字和大于0的数字

Question

我正在尝试验证用户必须输入数字的用户输入，并且必须大于0，验证只有数字我才能使用它;但是，我似乎无法纳入大于0的验证

float income;
cout << "How much did you earn last year: ";

    //validating imput for income
    while(!(cin >> income))
    {
         char ch;
         cin.clear();
         cout << "Sorry, number must be biger than \"0\" \n"
              << "How much did you make last year: ";
         while(cin.get(ch) && ch != '\n');
    }

Answer 1

只需将条件添加到while，然后在循环中处理：

while ( !(cin >> income) || income < 0.0 ) {
    if ( !cin )
        //  Clean up input stream...
    else
        //  Must be negative number... 
}