process main {
    num_lesser("6", "7") r;
    assert(r);

    num_lesser("7", "7") r;
    not(r) a;
    assert(a);

    num_greater("7", "6") r;
    assert(r);

    num_greater("7", "7") r;
    not(r) a;
    assert(a);

    num_lesser_equal("7", "7") r;
    assert(r);

    num_lesser_equal("8", "7") r;
    not(r) a;
    assert(a);

    num_greater_equal("7", "7") r;
    assert(r);

    num_greater_equal("7", "8") r;
    not(r) a;
    assert(a);

    num_equal("7", "7") r;
    assert(r);

    num_equal("6", "7") r;
    not(r) a;
    assert(a);

    num_equal("7", "6") r;
    not(r) a;
    assert(a);

    num_different("7", "6") a;
    assert(a);

    num_different("7", "007") a;
    not(a) a;
    assert(a);

    num_add("4", "7") r;
    strcmp(r, "11") a;
    assert(a);

    num_subtract("4", "3") r;
    strcmp(r, "1") a;
    assert(a);

    num_multiply("4", "5") r;
    strcmp(r, "20") a;
    assert(a);

    num_divide("7", "3") r;
    strcmp(r, "2") a;
    assert(a);

    num_modulo("7", "3") r;
    strcmp(r, "1") a;
    assert(a);

    exit("0");
}