问答题

试题源程序文件清单如下：
//number. cpp
#include "Number. h"
#include＜iostream＞
#include＜iomanip＞
#include＜strstream＞
using namespace std;
char Number::buf[33]="";
const char* HexNumber::toString() const
strstream str(buf,33);
str＜＜hex＜＜uppercase＜＜showbase＜＜n＜＜ends;
return buf;

const char * OctNumber::toString() const
strstream str(buf,33);
str＜＜oct＜＜showbase＜＜n＜＜ends;
return huf;

const char * DecNumber::toString() const
strstream str(buf,33);
str＜＜dec＜＜n＜＜ends;
return buf;

//proj2. cpp
#include"Number. h"
#include＜iostream＞
using namespace std;
void show(Number& number)
//**********found**********
____________; //按既定的数制显示输出参数对象number的值

int main()
show(OctNumber(11));cout<<’,’;
show(DecNumber(11));cout<<’,’;
//**********found**********
________________________; //以十六进制格式输出十进制数11
cout＜＜endl;
return 0: