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Atoi() is the C runtime library function for converting the ASCII representation of a number to an integer


Anything related to C or C++ standard library functions `fgets` (C) or `std::fgets` (C++)



So here fgets is reading more than one integer at a time from file so atoi is not getting the int too

from question  

C- Reading from a file and getting unexpected results when printing contents of it

Uggested solution use fgets to read i into a buffer then atoi or strtol to convert a buffer to an integer;or you could do an extra fgets after scanf or getchar in a loop until you ve read a newline but seriously the fgets solution is a lot more robust and worth learning now.

from question  

Issue with scanf() function in c?

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