题解 | #小乐乐定闹钟#

#include<iostream>
#include<iomanip>
//#include<format>

int main(int argc, char* argv[])
{
	unsigned short hours{},minutes{};
	unsigned int k{};
	std::cin >> hours;
	getchar();
	std::cin >> minutes >> k;
	if (hours < 24 && minutes<60)
	{
		hours = (hours + (minutes + k) / 60) % 24;
		minutes += k % 60;
		minutes %= 60;
	}
	/*c++20采用std::format字符串初始化，
	其格式说明符的一般形式如下[[fill]align][sign][#][0][:width][.precesion][type]
	std::cout << std::format("{:02d}:{:02d}", hours, minutes);*/

	std::cout.setf(std::ios::fixed,std::ios::right);
	std::cout << std::setfill('0') << std::setw(2) << hours << ":"<< std::setw(2) << minutes;
}