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並前往https://www.quora.com/Why-does-scanf-of-NULL-cause-this-program-to-go-into-an-infinite-loop

Why does scanf() of 'NULL' cause this program to go into an ...

As for why it's going into an infinite loop, it's because scanf() is refusing to read the input (and ... The safest way in C is to use the fgets() function.

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