/* Set bit "n" in "p". */

void insert (vector *p, int n)
{
    int q;
    int r;

    if (n < 0 || n >= p->n_bits) {
	croak ("Bit out of range");
    }

    q = n / 8;
    r = n % 8;

    p->chars[q] |= 1 << r;
}