int main()
{
    double inf = 1/0.0;
    double minus_inf = -1/0.0;
    double minus_zero = -1/ inf ;
    double nan = 0.0/0.0;

    printf(,inf);
    printf(,minus_inf);
    printf(,minus_zero);
    printf(,nan);

    

    printf(,inf + 2.0);
    printf(,inf - 10.1);
    printf(,inf + minus_inf);
    printf(,0.0 * inf);
    printf(,1.0/minus_zero);
    printf(,nan + 1.0);
    printf(,nan + nan);

    

    printf(,nan == nan ?  : );
    printf(,0.0 == minus_zero ?  : );

    return 0;
}