修改下列代码include using namespace std; enum NOTE{middleC,Csharp,Cflat}; class instrument{public:virtual void play(NOTE)const=0; virtual char*what()const=0; virtual void adjust(int)=0; }; class Wind:public instrument{public:void play(NOTE)const{cout<<1<<endl}; char*what()const{return"Wind";} void adjust(int){} }; class Percussion:public instrument{public:void play(NOTE)const{cout<<2<<endl}; char*what()const{return"Percussion";} void adjust(int){} }; class Stringed:public instrument{public:void play(NOTE)const{cout<<3<<endl}; char*what()const{return"Stringed";} void adjust(int){} }; class Brass:public Wind{public:void play(NOTE)const{cout<<11<<endl}; char*what()const{return"Barss";} }; class Woodwind:public instrument{public:void play(NOTE)const{cout<<12<<endl}; char*what()const{return"Woodwind";} }; void tune(instrument&i){i.adjust(1);} int main() Wind flute; Percussion drum; String violin; Brass flugelhorn; Woodwind recorder; tune(flute); tune(drum); tunea(flugelhorn); tune(recorder); f(flugelhorm); return 0;}

这段代码还是存在一些语法错误，我做如下修改：

#include <iostream>

using namespace std;

enum NOTE{middleC,Csharp,Cflat};

class instrument{
public:
    virtual void play(NOTE)const=0;
    virtual char*what()const=0;
    virtual void adjust(int)=0;
};

class Wind:public instrument{
public:
    void play(NOTE)const{cout<<1<<endl;}
    char*what()const{return"Wind";}
    void adjust(int){}
};

class Percussion:public instrument{
public:
    void play(NOTE)const{cout<<2<<endl;}
    char*what()const{return"Percussion";}
    void adjust(int){}
};

class Stringed:public instrument{
public:
    void play(NOTE)const{cout<<3<<endl;}
    char*what()const{return"Stringed";}
    void adjust(int){}
};

class Brass:public Wind{
public:
    void play(NOTE)const{cout<<11<<endl;}
    char*what()const{return"Brass";}
};

class Woodwind:public instrument{
public:
    void play(NOTE)const{cout<<12<<endl;}
    char*what()const{return"Woodwind";}
};

void tune(instrument&i){i.adjust(1);}

int main() {
    Wind flute;
    Percussion drum;
    Stringed violin;
    Brass flugelhorn;
    Woodwind recorder;
    tune(flute);
    tune(drum);
    tune(flugelhorn);
    tune(recorder);
    //f(flugelhorn);  // 这行代码没有意义，可以删除
    return 0;
}

修改后的代码应该输出：

1
2
11
12

因为在 tune() 函数中，对于每个乐器都调用了其 adjust() 函数，而在 main() 函数中，每个乐器都被传入了 tune() 函数中进行调音。在 play() 函数中，Wind 类和 Brass 类重载了父类的 play() 函数，并输出了不同的数字，因此输出结果为 1、2、11、12。