The default integer type is int — a 64-bit signed integer. This is what you should use for virtually all integer work:
Age-verification in Operating Systems and the Internet
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SDL uses a union headed by an enum for event polling (checking key presses, mouse movement, closing the window). I don't think would be possible to properly express tagged unions in APL without massive pain. Instead, I wrote functions that checked if keys were pressed, the mouse was moved and functions that returned relevant data if these events did happen.，详情可参考whatsapp