Ввод вручную несколько арифметических знаков

[nastya118]

Ожидаемый результат:
Программа должна менять знак на последний из введённых или же выдавать сообщение об ошибке.

Шаги:

1. Открыть калькулятор.
2. Кликнуть по полю ввода.
3. Ввести число с клавиатуры или вручную.
4. Вручную ввести любой арифметический знак.
5. Следом ввести еще один арифметический знак.

Фактический результат:
Программа разрешает вводить несколько арифметических знаков.

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