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- int number = int.Parse(Console.ReadLine());
- //валидно: [100; 200] или е 0 -> нищо
- //невалидно -> invalid
- bool isValid = (number >= 100 && number <= 200) || number == 0;
- //true -> числото валидно
- //!true -> false
- //false -> числото не е валидно
- //!false = true
- if (!isValid)
- {
- Console.WriteLine("invalid");
- }
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