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  4. Force the buffer contents to be written to the file
//Header: #include
//Declaration: int fflush(FILE *stream);
//Return: 0 on success or EOF on error.
#include
#include
int main(void){
FILE *filep;
if((filep=fopen("testing", "rb"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
char ch = 'C';
int j;
for(j=0; j<5; j++) {
fwrite(ch, sizeof(ch), 1, filep);
fflush(filep);
}
fclose(filep);
return 0;
}