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AFAIK, getch() and getche() aren't ANSI C functions. Therefore, you are not guaranteed that they will work. I know for a fact that it doesn't work on gcc and that it works on Turbo/Borland C++.
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I was just about to say the same thing. scanf() is a very fussy function. Sometimes, it just refuses to scan. To get single letters from input, I find getchar() to be much much better.

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