FILE *fopen(const char *filename, const char *mode);

Open file

Opens the file whose name is specified in the parameter filename and associates it with a stream that can be identified in future operations by the FILE object whose pointer is returned. The operations that are allowed on the stream and how these are performed are defined by the mode parameter.
The running environment supports at least FOPEN_MAX files open simultaneously; FOPEN_MAX is a macro constant defined in .

int fclose(FILE * stream);

Close file

Closes the file associated with the stream and disassociates it.
All internal buffers associated with the stream are flushed: the content of any unwritten buffer is written and the content of any unread buffer is discarded.
Even if the call fails, the stream passed as parameter will no longer be associated with the file.
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