timePlusMinus.cpp

#include <iostream> 
using namespace std;

struct Time
{
	int h,m,s;
};

Time t1,t2;

Time sum(Time a, Time b){
	// cong giay 
	Time c;

	// reset mac dinh ve 0:0:0
	c.s = 0;
	c.m = 0;
	c.h = 0;

	// tien hanh cong giay
	c.s = a.s +b.s;
	if(c.s >=60){
		int increMinue = c.s/60;
		c.s = c.s - (increMinue * 60);
		// tang so phut
		c.m = c.m + increMinue;
	}
	// cong phut
	
	c.m = c.m + (a.m + b.m);

	if(c.m >= 60){
		int increasehour = c.m / 60;
		c.m = c.m - (60*increasehour);
		c.h = c.h + increasehour;
	}
	// hour
	c.h = c.h + a.h + b.h;
	if(c.h >=24){
		c.h = c.h - ((c.h/24) * 24);
	}

	return c;

}
int main(){

	t1.h = 12;
	t1.m = 59;
	t1.s = 30;

	t2.h = 15;
	t2.m = 0;
	t2.s = 30;

	// tinh t1 + t2
	Time s = sum(t1, t2);
	cout << t1.h <<":" << t1.m<< ":" << t1.s<< "+" << t2.h <<":" << t2.m<< ":" << t2.s<< endl;
	cout << s.h <<":" << s.m<< ":" << s.s;


	return 0;
}