C++两种字符串传参构造函数

第一种：

 #include"iostream"
 #include"string"
 using namespace std;

 class Motor{
 protected:
     int n;
     int tire;
     double motor;
     char *str1;    //基类为指针
     char *str2;
 public:
     virtual void Display()=;
 };

 class Car:public Motor{
 public:
     Car(char *Str1,char *Str2,int N,int Tire,double Motor){
         str1 = new char[strlen(Str1)+];    //要先获得字符串大小
         str2 = new char[strlen(Str2)+];
         strcpy(str1,Str1);
         strcpy(str2,Str2);
         n = N;
         tire = Tire;

         motor = Motor;
     }
     ~Car(){
         delete[] str1;    //最后要删除内存
         delete[] str2;
     };
     virtual void Display(){
         cout<<"the car"<<"可载人数:"<<n<<"、轮胎数:"<<tire<<"、马力数:"<<motor<<endl;
         cout<<"产于"<<str1<<"车的主人为："<<str2<<endl;
     }
 };

第一种相对而言可以节省内存，不怕传入的字符串过长，但要记得删除指针释放内存

第二种：

 #include"iostream"
 using namespace std;
 #define pi 3.14159

 class Motor{
 protected:
     int man,wheel,mata;
     char produce[];    //基类为数组
     char owner[];
 public:
     Motor(int m,int w,int ma,char* pro,char* own){
         man=m; wheel=w; mata=ma;
         strcpy(produce,pro);    //不必获得字符串大小，因开始已指定
         strcpy(owner,own);
     }
     //无需虚构函数去删除指针，不会泄露内存
     virtual void Dispaly(){
         cout<<"the motor"<<"可载人数:"<<man<<"、轮胎数:"<<wheel<<"、马力数:"<<mata<<endl;
         cout<<"产于"<<produce<<"车的主人为："<<owner<<endl;
     }
 };

 class Car:public Motor{
 public:
     Car(int m,int w,int ma,char* pro,char* own):Motor(m, w, ma, pro, own){}
     void Dispaly(){
         cout<<"the car"<<"可载人数:"<<man<<"、轮胎数:"<<wheel<<"、马力数:"<<mata<<endl;
         cout<<"产于"<<produce<<"车的主人为："<<owner<<endl;
     }
 };

第二种相对而言更简便，但往往浪费内存，不确定传入的字符串参数大小。