How to make a program to find difference of 2 heights using '-' operator?

CODE

How to make a program to find difference of 2 heights using '-' operator?

//Method-1

#include<iostream>

#include<cmath>

using namespace std;

class height

{

    int f,i,h;

public:

    void input()

    {

        cout<<"\n feet:";

        cin>>f;

        cout<<"\n inches:";

        cin>>i;

        h=f*12+i;

    }

    height operator - (height a)

    {

        height b;

        b.h=abs(h-a.h);

        return (b);

    }

    void show()

    {

        f=h/12;

        i=h%12;

        cout<<"\n difference="<<f<<"feet and "<<i<<"inches";

    }

};

int main()

{

    height h1,h2,h3;

    cout<<"\n enter height of first person:";

    h1.input();

    cout<<"\n enter height of second person:";

    h2.input();

    h3=h1-h2;

    h3.show();

}

Output:

enter height of first person:

 feet:45

 inches:74

 enter height of second person:

 feet:25

 inches:96

 difference=18feet and 2inches

//Method -2

#include<iostream>

#include<cmath>

using namespace std;

class height

{

    int f,i,h;

public:

    void setval(int f1,int i1)

    {

        f=f1;

        i=i1;

        h=f*12+i;

    }

    void show()

    {

        cout<<"difference:";

        cout<<f<<" "<<i;

    }

    height operator -(height a)

    {

        height b;

        b.h=abs(h-a.h);

        b.f=b.h/12;

        b.i=b.h%12;

        return(b);

    }

};

int main()

{

    height h1,h2,h3;

    int f2,i2,f3,i3;

    cout<<"\n enter the height of first person:\nfeet:";

    cin>>f2;

    cout<<"\n inches:";

    cin>>i2;

    cout<<"\n enter the height of second person:\nfeet:";

    cin>>f3;

    cout<<"\n inches:";

    cin>>i3;

    h1.setval(f2,i2);

    h2.setval(f3,i3);

    h3=h1-h2;

    h3.show();

}

Output:

enter the height of first person:

feet:21

 inches:63

 enter the height of second person:

feet:87

 inches:25

difference:62 10