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並前往https://itqna.net/questions/7773/how-make-wrong-user-entry-not-bug-program

How to make a wrong user entry not bug the program? - It_qna

Better yet to use fgets() followed by sscanf() : char tmp[20]; if (!fgets(tmp, sizeof tmp, stdin)) /* erro */; if (sscanf(tmp, "%d", ...

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