C++ | Friend function 10

Question:5
Class Distance (km,m,cm,mm)
Declare a class named distance with attributes as km,m,cm and mm. Take input for two distances calculate and display their sum (Without using friend function).
Sol:

#include<iostream>
using namespace std;
class distance1
{
	private:
		int km,m,cm,mm;
	public:
		void read();
		void show();
		distance1 add(distance1 d);
};
void distance1::read()
{
	cout<<"Enter km, m , cm and mm ";
	cin>>km>>m>>cm>>mm;
}
void distance1::show()
{
	cout<<km<<" km "<<m<<" m "<<cm<<" cm "<<mm<<" mm"<<endl;
}
distance1 distance1::add(distance1 d)
{
	distance1 t;
	t.km=km+d.km;
	t.m=m+d.m;
	t.cm=cm+d.cm;
	t.mm=mm+d.mm;
	if(t.mm>=10)
	{
		t.cm=t.cm+t.mm/10;
		t.mm=t.mm%10;
	}
	if(t.cm>=100)
	{
		t.m=t.m+t.cm/100;
		t.cm=t.cm%100;
	}
	if(t.m>=1000)
	{
		t.km=t.km+t.m/1000;
		t.m=t.m%1000;
	}
	
	return(t);
}

int main()
{
	distance1 e1,e2,e3;
	e1.read(); e2.read();
	e1.show(); e2.show();
	e3=e1.add(e2);
	e3.show();
	return(0);
}

Output:

Enter km, m , cm and mm 2  50  45  5
Enter km, m , cm and mm 3  56  65  6
2 km 50 m 45 cm 5 mm
3 km 56 m 65 cm 6 mm
5 km 107 m 11 cm 1 mm

Question:6
Class time (hh, mm, ss)
Declare a class named time with attributes as hh,mm and ss. Take input for two time calculate and display their sum (Without using friend function).
Sol:

#include<iostream>
using namespace std;
class time1
{
	private:
		int hh,mm,ss;
	public:
		void read();
		void show();
		time1 add(time1 d);
};
void time1::read()
{
	cout<<"Enter hh, mm and ss ";
	cin>>hh>>mm>>ss;
}
void time1::show()
{
	cout<<hh<<" hh "<<mm<<" mm "<<ss<<" ss "<<endl;
}
time1 time1::add(time1 d)
{
	time1 t;
	t.hh=hh+d.hh;
	t.mm=mm+d.mm;
	t.ss=ss+d.ss;
	if(t.ss>=60)
	{
		t.mm=t.mm+t.ss/60;
		t.ss=t.ss%60;
	}
	if(t.mm>=60)
	{
		t.hh=t.hh+t.mm/60;
		t.mm=t.mm%60;
	}
	
	return(t);
}

int main()
{
	time1 e1,e2,e3;
	e1.read(); e2.read();
	e1.show(); e2.show();
	e3=e1.add(e2);
	e3.show();
	return(0);
}

Output:

Enter hh, mm and ss 2 50 20
Enter hh, mm and ss 4 30 45
2 hh 50 mm 20 ss
4 hh 30 mm 45 ss
7 hh 21 mm 5 ss

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