如何驗證用戶輸入的數字和大於0的數字

Question

我正在嘗試驗證用戶輸入的內容，即用戶必須輸入數字並且該數字必須大於0，這僅是我使它有效的數字的驗證； 但是，我似乎無法合並大於0的驗證

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

只需將條件添加到while ，然后在循環中處理它：

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