#include <iostream>

using namespace std;

class Distance
{
private:
    int feet;
    float inches;
public:
Distance()
{
    feet=0;
    inches=0.0;
}

Distance(int ft, float inc )
{
    feet=ft;
    inches=inc;
}

void get_distance()
{
    cout << "write feets: \n";
    cin >> feet;
    cout << "write inches: \n";
    cin >> inches;
}

void show_distance()
{
    cout << feet << "\'" << inches << '\"'<<endl;
}

Distance operator+(Distance d2) const
{
    int f = feet + d2.feet;
    float i = inches + d2.inches;
    if (i >=12.0){
        i -= 12.0;
        f++;
    }
    return Distance(f,i);
}

Distance operator-(Distance d2) const
{
    if ( (d2.feet>feet) || ( (d2.feet==feet) && (d2.inches>inches) ) ){
        cout<<"subtraction is not possible"<<endl;
        return Distance(0,0);
    }
    else
    {
    int f = feet - d2.feet;
    float i=0;
    if (d2.inches > inches){
        i += 12.0;
        f--;
    }
    i  = i+inches - d2.inches;
    return Distance(f,i);
    }
}

Distance operator*(int a)
{
    inches=inches*a;
    feet=feet*a;
    if(inches>=12){
        inches -= 12.0;
        feet++;
    }
    return Distance(feet,inches);
}
Distance operator/(int a)
{
    inches=inches+feet*12;
    feet=0;
    inches=inches/2;
    while(inches>=12){
        inches -= 12.0;
        feet++;
    }
    return Distance(feet,inches);
}

void operator+=(Distance d2)
{
    int f = feet + d2.feet;
    float i = inches + d2.inches;
    if (i >=12.0){
        i -= 12.0;
        f++;
    }
    feet=f;
    inches=i;
}

void operator-=(Distance d2)
{
    if ((d2.feet>feet) || ((d2.feet==feet)&&(d2.inches>inches))){
        cout<<"subtraction is not possible"<<endl;
    }
    else
    {
        int f = feet - d2.feet;
        float i=0;
        if (d2.inches > inches){
            i += 12.0;
            f--;
        }
        i  = i+inches - d2.inches;
        feet=f;
        inches=i;
    }
}

void operator*=(int a)
{
    inches=inches*a;
    feet=feet*a;
    if(inches>=12){
        inches -= 12.0;
        feet++;
    }
}

void operator/=(int a)
{
    inches=inches+feet*12;
    feet=0;
    inches=inches/2;
    while(inches>=12){
        inches -= 12.0;
        feet++;
    }
}

bool operator<( Distance s )
{
    if ( feet<s.feet )
        return true;
    else if ( (feet==s.feet)&&(inches<s.inches) )
        return true;
    else return false;
}
bool operator>( Distance s )
{
    if ( feet>s.feet )
        return true;
    else if ( (feet==s.feet)&&(inches>s.inches) )
        return true;
    else return false;
}

bool operator<=( Distance s )
{
    if ( feet<s.feet )
        return true;
    else if ( (feet==s.feet)&&(inches<=s.inches) )
        return true;
    else return false;
}
bool operator>=( Distance s )
{
    if ( feet>s.feet )
        return true;
    else if ( (feet==s.feet)&&(inches>=s.inches) )
        return true;
    else return false;
}

bool operator==( Distance s)
{
    if ((feet==s.feet)||(inches==s.inches))
        return true;
    else return false;
}

bool operator!=( Distance s)
{
    if (feet!=s.feet)
        return true;
    if (inches!=s.inches)
        return true;
    else return false;
}

~Distance() {}
};
int main()
{
    Distance x;
    Distance y;

    x.get_distance();
    x.show_distance();
    y.get_distance();
    y.show_distance();
    x-=y;
    x.show_distance();

    return 0;
}