8.17建立一个类模板实现求3个数之和

#include<iostream>
using namespace std;
template<typename T>
class sum{
	private:
		T x,y,z;
	public:
		sum(T a,T b,T c)
		{
			x=a;
			y=b;
			z=c;
		}
		T add()
		{
			return x+y+z;
		}
		void print()
		{
			cout<<x<<" "<<y<<" "<<z<<endl;
		}
};
int main()
{
	sum<int> s1(1,2,3);
	sum<double> s2(1.1,2.2,3.3);
	cout<<"三个整数分别为："<<endl;
	s1.print();
	cout<<"三个整数之和为："<<s1.add()<<endl;
    cout<<"三个双精度整数分别为:"<<endl;
	s2.print();
	cout<<"三个双精度整数之和为:"<<s2.add()<<endl;
	return 0;
}