c++ - 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输入，即用户必须输入数字并且它必须大于 0，仅验证数字我让它工作；但是，我似乎无法合并大于 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中，并在循环中处理:

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