题解 | #总成绩和平均分计算#

#include<iostream>
#include<iomanip>
using namespace std;

int main()
{
	double score1,score2,score3;
	std::cin >> score1 >> score2 >> score3; 
	double sum, avg;
	sum = score1 + score2 + score3;
	avg = sum / 3;
	std::cout << setiosflags(ios::fixed);
	std::cout << setprecision(2) << sum << " " << avg;

	return 0;
}