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Setbuf

Item Value Header filestdio.h Declarationvoid setbuf(FILE *stream, char *buf); Functionspecifies the buffer that stream will use or, Set buf to null to turn off buffering. The buffer must be BUFSIZ characters long. BUFSIZ is defined in . #include <stdio.h> int main () {   char buffer[BUFSIZ];   FILE *fp1, *fp2;   fp1=fopen ("test.txt","w");   fp2=fopen ("test2.txt","a");   setbuf ( fp1 , buffer );   fputs ("This is sent to a buffered stream",fp1);   fflush (fp1);   setbuf ( fp2 , NULL );    fputs ("This is sent to an unbuffered stream",fp2);   fclose (fp1);   fclose (fp2);   return 0; }