#include<iostream> #include<string> using namespace std; class MyArray{

Question

public:
MyArray(int leng);
~MyArray();
void Input();
void Display(string);
protected:
int *alist;
int length;
};
MyArray::MyArray(int leng)
{if(leng<=0)
{cout<<"error length";
exit(1);
}
alist=new int [leng];
length=leng;
if(alist==NULL)
{cout<<"assign failure";
exit(1);
}
cout<<"MyArray类对象已创建。"<<endl;
}
MyArray()::
~MyArray();
{delete[] alist;
cout<<"MyArray类对象被撤销."<<endl;
}
void MyArray::Display(string str)
{int i;
int *p=alist;
cout<<str<<length<<"个整数：";
for(i=0;i<length;i++,p++)
cout<<*p<<"";
cout<<endl;
}
void MyArray::Input()
{cout<<"请键盘输入"<<length<<"个整数:";
int i;
int *p =alist;
for(i=0;i<length;i++,p++)
cin>>*p;
}
int main()
{MyArray a(5);
a.Input();
a.Display("显示已输入的");
return 0;
}
帮忙调一下哈

Answer 1

修改后的如下：
#include<iostream>
#include<string>
using namespace std;
class MyArray{
public:
MyArray(int leng);
~MyArray();
void Input();
void Display(string);
protected:
int *alist;
int length;
};
MyArray::MyArray(int leng)
{
if(leng<=0){cout<<"error length";exit(1);}
alist=new int [leng];
length=leng;
if(alist==NULL){cout<<"assign failure";exit(1);}
cout<<"MyArray类对象已创建。"<<endl;
}
MyArray::~MyArray() // <-------------这里修改下
{
if(alist!=NULL) delete[] alist; // 不为空才delete
cout<<"MyArray类对象被撤销."<<endl;
}
void MyArray::Display(string str)
{
int i;
int *p=alist;
cout<<str<<length<<"个整数：";
for(i=0;i<length;i++,p++)cout<<*p<<"";
cout<<endl;
}
void MyArray::Input()
{
cout<<"请键盘输入"<<length<<"个整数:";
int i;
int *p =alist;
for(i=0;i<length;i++,p++)
cin>>*p;
}
int main()
{
MyArray a(5);
a.Input();
a.Display("显示已输入的");
return 0;
}
楼主，有点懒啊。这样不好。