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Standard C libraries used by SHYSTER

`math`

fabs: returns the absolute value of its argument;
floor: returns the greatest integral value less than or equal to its argument; and
sqrt: returns the square root of its argument.

`stdio`

EOF: a constant returned upon reaching the end of a file;
fclose: causes any buffered data waiting to be written for the given stream to be written out, and the stream to be closed;
FILE: a defined type for streams;
fopen: opens a given file, associates a stream with it, and returns a pointer to the file structure associated with that stream;
fprintf: places output on a given stream;
fscanf: reads from a given stream;
getc: returns the next character from a given input stream;
gets: reads characters from the standard input stream into a string;
NULL: a constant which designates a null pointer;
sprintf: places output, followed by the null character, in consecutive bytes of a string;
stderr: the standard error stream;
stdin: the standard input stream;
stdout: the standard output stream; and
ungetc: pushes a character back onto a given input stream.

`stdlib`

exit: closes any open files and terminates program execution;
EXIT_FAILURE: a constant returned to the operating system to indicate that the program has terminated unsuccessfully;
EXIT_SUCCESS: a constant returned to the operating system to indicate that the program has terminated successfully;
free: frees storage earlier allocated;
malloc: allocates storage; and
realloc: reallocates storage.

`string`

strchr: returns a pointer to the first occurrence of a given character in a given string, or a null pointer if it does not occur; and
strcmp: returns zero if two given strings are identical.

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