Remark to integer division and
remainder:
If one or both arguments are negative the sign of the result is as follows:
-5 / 3 ==> -1,
5 / -3 ==> -1,
-5 / -3 ==> 1
and the remainder:
-5 % 3 ==> -2,
5 % -3 ==> 2,
-5 % -3 ==> -2.
Unlike C feof,
this function checks whether the next character does exist.
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