//Header file: #include
//Declaration: void setbuf(FILE *stream, char *buf);
#include
int main ()
{
char buffer[BUFSIZ];
FILE *filep1, *filep2;
filep1=fopen ("testfile.txt","w");
filep2=fopen ("testfile2.txt","a");
setbuf ( filep1 , buffer );
fputs ("This is sent to a buffered stream",filep1);
fflush (filep1);
setbuf ( filep2 , NULL );
fputs ("This is sent to an unbuffered stream",filep2);
//Set buf to null to turn off buffering.
//The buffer must be BUFSIZ characters long.
//BUFSIZ is defined in .
fclose (filep1);
fclose (filep2);
return 0;
}