I'm creating a default constructor for a struct and setting all values to 0, but there is a substruct and value (Date birthDate) referenced and I'm not sure how to handle it.
The Date struct includes 3 integers: day, month, year. Combined they = birthDate.
Reptile::Reptile(){
    species = " ";
    DangerAssessment dangerAssess = "";
    Date birthDate() = 0;
    SizeOfEnclosure sizeofenclosure;
    exhibitName = " ";
    }