单项选择题

下列程序的输出结果是( )。     #include<iostream.h>     class Myclass {      public:Myclass(int i=0,intj=0)       { x=i;        y=j;       }       void show( ) { cout < < "x=" < < x < < " " < "y=" < < y < < end1;}       void show( )const { cout < < "x=" < < " " < < "y=’’ < < y < < end1;}       privated:          int x;    int y;       };      void main( )     { Myclass my1(3,4);      const my2(7,8);      my1.show( );my2.show( );}

A.line 4
B.line 6
C.line 7
D.line 8