If the given stream was open for writing (or if it was open for updating and the last i/o operation was an output operation) any unwritten data in its output buffer is written to the file.Syntax:
int fflush ( FILE * stream );Example:
FILE * pFile;
pFile = fopen ("example.txt","r+");
if (pFile == NULL) perror ("Error opening file");
fflush (pFile); // flushing or repositioning required
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