Just press the quotation mark key before the enter key. Note that you need to press the shift key at the same time when double quotation marks are used, and you don't need to press this key when single quotation marks are used.

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The two are the same, there is no distinction between up and down directions, which is different from the quotation marks in Chinese. Besides, please be sure to enter it in English. If you enter single quotation marks in Chinese, the compilation will be wrong.

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When I say "English status", I mean that the input method is in English, so don't enter the program code in the Chinese input method.

If the two single quotes entered are the same, that's right.