C++ Primer Plus

Program Notes

The heart of the error-handling code in Listing 6.14 is the following:

while (!(cin >> golf[i])) {    cin.clear();     // reset input    while (cin.get() != '\n')        continue; // get rid of bad input    cout << "Please enter a number: ";}

If the user enters 88, the cin expression is true, and a value is placed in the array. Furthermore, because cin is true, the expression !(cin >> golf[i]) is false, and this inner loop terminates. But if the user enters must i?, the cin expression is false, nothing is placed into the array, the expression !(cin >> golf[i]) is true, and the program enters the inner while loop. The first statement in the loop uses the clear() method to reset input. If you omit this statement, the program refuses ...