C++构造函数问题16-yiteyi-C++库

预测以下程序的输出？

null

                     #include <iostream>                   
                     using                               namespace                               std;                   
                     class                               Test                   
                     {                   
                     private                               :                   
                                         int                               x;                   
                     public                               :                   
                                         Test(                               int                               i)                   
                                         {                   
                                         x = i;                   
                                         cout <<                               "Called"                               << endl;                   
                                         }                   
                     };                   
                             
                     int                               main()                   
                     {                   
                                         Test t(20);                   
                                         t = 30;                               // conversion constructor is called here.                   
                                         return                               0;                   
                     }                   