/* $begin swap */
/* swap.c */
extern int buf[];

int *bufp0 = &buf[0];
int *bufp1;

void swap() 
{
    int temp;

    bufp1 = &buf[1];
    temp = *bufp0;
    *bufp0 = *bufp1;
    *bufp1 = temp;
}
/* $end swap */