Inputting float into a program that only deals with ints?

It looks like scanf() is reading your "3" in the second case, and ignoring the "9".

Console input is line buffered; when you enter 3.9 into a %d format specifier, only the 3 is consumed, the remaining data remains buffered, so the second scanf() call attempts to convert it according to its specifier, it finds a '.' and aborts the conversion leaving be undefined.

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