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並前往https://www.codesdope.com/discussion/why-are-you-using-a-space-before-c-in-scanf-c-ch/

Why are you using a space before %c in scanf(" %c", &ch) ?

Space before %c removes any white space (blanks, tabs, or newlines). It means %c without space will read white sapce like new line(\n), spaces(' ') or tabs(\t).

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