4.auto详解

 #include <iostream>
 using namespace std;

 template <calss T1,class T2>
 auto add(T1 t1, T2 t2)
 {
     return t1 + t2;
 }

 //auto自适应数据类型,自动推理
 void main()
 {
     auto num = ;
     cout << typeid(num).name() << endl;

     int a[] = { ,,,, };

     for (auto i : a)
     {
         cout << i << endl;
     }

     cin.get();
 }