【8.17】建立一个用来实现求3个数和的类模板（将成员函数定义在类模板的内部），并写出调用此类模板的完整程序。

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#include<iostream>
using namespace std;
template<typename T1,typename T2,typename T3>
class sum
{
    T1 x;
    T2 y;
    T3 z;
public:
    sum(T1 a,T2 b,T3 c)
    {
        x=a;y=b;z=c;
    }
    void gettersum()
    {
        cout<<x+y+z<<endl;
    }
    T1 getterx()
    {
        return x;
   }
    T2 gettery()
    {
        return y;
    }
    T3 getterz()
    {
        return z;
    }
};
int main()
{
    sum<double,double,double>a(1.4,1.7,1.3);
    cout<<a.getterx()<<","<<a.gettery()<<","<<a.getterz()<<"三个数之和为:";
    a.gettersum();
    sum<int,double,float>b(5,2.2,4.7);
      cout<<b.getterx()<<","<<b.gettery()<<","<<b.getterz()<<"三个数之和为:";
      b.gettersum();
     return 0;
}

运行结果：

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