More C++ Help Please! Header file not functioning correctly!

Question

I know that this is technically not the correct way to use header files, but all I want is for my code to work and compile correctly. I always appreciate the help. I get the error that the Allele objects are not defined as type.
#ifndef STRUCTURE_H
#define STRUCTURE_H
#include <iostream>
using namespace std;
class Allele{
public:
string phenotype;
bool isDominant;
};

class Genotype {

public:
bool isDominant;
void makeGenotype(const Allele& firstAllele, const Allele& secondAllele) {
if (firstAllele.isDominant) {
isDominant = true;
cout << "The animal is, " + firstAllele.phenotype;

}
if (secondAllele.isDominant) {
isDominant = true;
cout << "The animal is, " + secondAllele.phenotype;

}
}

};

Allele HairyDominant;
Allele HairyRecessive;
Allele GiantHeadDominant;
Allele GiantHeadRecessive;
Allele EyeColorOrangeDominant;
Allele EyeColorOrangeRecessive;
HairyDominant.phenotype="Hairy";
HairyDominant.isDominant= true;
HairyRecessive.phenotype=" Not Hairy";
HairyRecessive.isDominant= false;
GiantHeadDominant.phenotype="Giant Head";
GiantHeadDominant.isDominant= true;
GiantHeadRecessive.phenotype= "Not Giant Headed";
GiantHeadRecessive.isDominant= false;
EyeColorOrangeDominant.phenotype= "Not Orange Eyed";
EyeColorOrangeDominant.isDominant=true;
EyeColorOrangeRecessive.phenotype= "Orange Eye";
EyeColorOrangeRecessive.isDemoninat=false;
Genotype Hairy;
Genotype GiantHead;
Genotype OrangeEyes;

#endif

Answer 1

George Ryan where did you assign all the values? They're supposed to be done in the main function.

Answer 2

You are assigning values in a header file, which is illegal. Either:
1) Initialize the object when it is instantiated, using constructor.

2) Assign values to the object fields in the source file.

Answer 3

I'm used to python syntax so I put it above the main function.