第6周实验报告2

#include <iostream>

using namespace std;

class A
{
private:
int a;
public:
A() {a=0;}
A(int aa):a(aa){}  //定义构造函数，用参数aa初始化数据成员a
};
int main()
{
A *p;  //定义类A的指针对象p
p = new A ();   //用p指向动态对象并初始化为整数
}

#include <iostream>

using namespace std;

class A
{
private:
int *a;
int n;
int MaxLen;
public:
A(int *, int, int);
A(): a(NULL), n(0), MaxLen(0) {}
~A();
int GetValue(int i) {return a[i];}
};
A::A(int *aa, int nn, int MM)
{
n=nn;
MaxLen=MM;
if(n>MaxLen) exit(1);
a=new int[MaxLen];
for (int i = 0;i < MaxLen; *(a + i) = * (aa + i), ++i);  //以i为循环变量把aa数组中每个元素值传送给a数组的对应元素中
}
A::~A(){delete []a;}   //析构函数的类外定义，释放指针型数据a所指向的空间

int main()
{
int b[10]={1,2,3,4,5,6,7,8,9,10};
A r(b,10,10);
int i,s=0;
for (i = 0; i < 10; s +=r.GetValue(i), ++i); //以i为循环变量，把r对象的a数据成员中的每个元素值依次累加到s中
cout<<"s="<<s<<endl;
system ("pause");
}