Posted on 2006-01-15 13:10 sopherwenxin
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Both scanf and wscanf return the number of fields successfully converted
and assigned; the return value does not include fields that were read but
not assigned. A return value of 0 indicates that no fields were assigned.
The return value is EOF for an error or if the end-of-file character or the
end-of-string character is nocountered in the first attempt to read a character.
scanf("%d%d", &a, &b);
如果遇到错误或遇到end of file，返回值为EOF。