C/stdio.h/fclose
fclose: Closes the file and flushes its buffer
//Declaration : int fclose(FILE *stream);
//Return value: If successful, zero is returned, or EOF is returned.
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fp;
if((fp=fopen("test", "rb"))==NULL) {
printf("Cannot open file.\n");
exit(1);
}
if(fclose(fp))
printf("File close error.\n");
return 0;
}