#define _CRT_SECURE_NO_WARNINGS
#include
using namespace std;
//等号运算符的重载
class Array
{
public:
//int strlen(char *)
Array(char *t1=0)
{
this->length=strlen(t1);
this->p = new char [length +1];
strcpy(p,t1);
}
Array(const Array &t2)
{
this->length=t2.length;
this->p = new char [length +1];
strcpy(p,t2.p);
}
Array& operator=(Array &obj1)
{
//先释放旧的内存
if (this->p != NULL)
{
delete[] p;
length = 0;
}
//2 根据obj1分配内存大小
this->length = obj1.length;
this->p = new char [length+1];
//把obj1赋值
strcpy(p, obj1.p);
return *this;
}
~Array()
{
if(*p !=NULL)
{
delete [] p;
length=0;
}
}
void printf()
{
cout<<this->p;
}
private:
int length;
char *p;
protected:
};
int main()
{
Array a1("dasfsf");
Array a2=a1;//调用赋值构造函数,必须重新定义,要不然是浅拷贝,出错
a2.printf();
cout<<endl;
Array a4("dasda");
Array a3;
a3=a4;//浅拷贝,需重新定义等号。
a3.printf();
cout<<endl;
system("pause");
return 0;
}
源码如上,其中编译正确,却运行不了,如果把类中的构造函数的形参的默认赋值等于零,则正确,但是不知道为什么呢?