类中字符串赋值

xueyuyanghf2006

a.h头文件
#ifndef A_H_
#define A_H_
class Cd
{
private:
        static const int NUM=50;
        char performers[NUM];
        char label[NUM];
        int  selections;
        double playtime;
public:
        Cd(const char * s1,const char * s2,int n,double x);
        Cd(const Cd & d);
        Cd();
        ~Cd();
        virtual void Report()const;
        Cd & operator=(const Cd & d);

};
class Classic :public Cd
{
  private:
         static const int NUM1=10;
         char Name[NUM1];
  public:
        Classic(const char * s1,const char * s2,const char *s3,int a,double b);
        virtual void Report()const;

};
#endif
#include<iostream>
using namespace std;
#include"a.h"
#include<cstring>


Cd::Cd(const char * s1,const char * s2,int n,double x)
{
   strncpy(performers,s1,strlen(s1));
   performers[strlen(s1)+1]='\0';
   strcpy(label,s2);
   selections=n;
   playtime=x;
}
Cd::Cd(const Cd & d)
{
    for(int i=0;i<NUM;i++)
    {
      performers=d.performers;
      label=d.label;
    }
    selections=d.selections;
    playtime=d.playtime;
}
Cd::Cd()
{
  strcpy(performers,"NULL";
  strcpy(label,"NULL";
  selections=0;
  playtime=0;

}
Cd::~Cd()
{
  cout<<"invoke"<<endl;
}
void Cd::Report()const
{
   cout<<"performances:"<<performers<<endl;
   cout<<"label:"<<label<<endl;
   cout<<selections<<endl;
   cout<<playtime<<endl;
}
            cout<<playtime<<endl;
}
Cd & Cd:perator=(const Cd & d)
{
     for(int i=0;i<NUM;i++)
    {
      performers=d.performers;
      label=d.label;
    }
    selections=d.selections;
    playtime=d.playtime;
}

Classic::Classic(const char * s0,const char * s1,const char *s2,int n,double x):Cd(s1,s2,n,x)
{
   strcpy(Name,s0);

}
void Classic::Report()const
{
   cout<<"Name:"<<Name<<endl;
}

驱动程序：#include<iostream>
using namespace std;
#include"a.h"
//void Bravo(const Cd & disk);
int main()
{
  Cd c1("Beatles","Captiol",14,35.5);
  c1.Report();
  Classic c2=Classic("iano Sonata in B flat,Fantasia in C","alfred brendel","philips",2,57.17);
  Cd *pcd=&c1;
  cout<<"using object directly:"<<endl;
  c1.Report();
  c2.Report();
  cout<<"using type cd * pointer to objects"<<endl;
  //pcd->Report();
  //pcd=&c2;
// pcd->Report();
cout<<"calling a function with a Cd reference argument"<<endl;
//  Bravo(c1);
//  Bravo(c2);
//  cout<<"testing assignment";
  return 0;

}
//void Bravo(const Cd & disk)
//{
//   disk.Report();
//}
结果：：
label:Captiol
14
35.5
using object directly:
performances:B flat,Fantasia in C 这个出错了？？？
label:Captiol
14
35.5
Nameiano Sonata in B flat,Fantasia in C ？？？
using type cd * pointer to objects
calling a function with a Cd reference argument
invoke
invoke

[ 本帖最后由 xueyuyanghf2006 于 2009-5-7 14:03 编辑 ]

dreamice

发这种贴，要么用[code][/code]括起来，要么禁止smile吧，太难看了

prolj

[code][/code]括起来也要禁smile，不然还会出现的。

daybreakcx

楼上的改签名了，装B的已经消失了吗？