程序代码：

#include<iostream>
#include<stdio.h>
class csum
{
     public:
             virtual int add(int a,int b)
             {
           return      (a+b);
             }
        
      };

      int main ( )
      {int a;
           csum*  pcsum=new csum;
           printf("number is %i,the other number is %i",a,pcsum);
           getchar();
         return 0;
           }