帮忙看下这段C++程序有什么问题

[idea_yuye]

#include<iostream>
using namespace std;
class A
{
int top;
int buffer[100];
public:
A() {top=-1;}
bool push(int i)
{
if(top==100-1)
{
cout <<"stack is overflow.\n";
return false;
}
else
{
top++;
buffer[top]=i;
return true;
}
}
public:
void disp(int bufferd[])
{
int i;
for(i=0;i<=top;i++)
cout << bufferd[i];
}
}
int main()
{
int x;
A st;
cin >> x;
st.push(x);
st.disp(st.buffer);
return 1;
}
请帮我讲解一下错在那！非常感谢啊！

[机智的呆呆]

int buffer[100]; 是私有的~~~

[太乙]

#include <iostream> 
using namespace std; 
class A 
{ 
	int top; 
	int buffer[100]; 
public: 
	A() {top=-1;} 
	bool push(int i) 
	{ 
		if(top==100-1) 
		{ 
			cout <<"stack is overflow.\n"; 
			return false; 
		} 
		else 
		{ 
			top++; 
			buffer[top]=i; 
			return true; 
		} 
	} 
public: 
	void disp() 
	{ 
		int i; 
		for(i=0;i <=top;i++) 
			cout << buffer[i]; 
	} 
};
int main() 
{ 
	int x; 
	A st; 
    cin >> x; 
	st.push(x); 
	st.disp(); 
    return 1; 
} 

[xhs_lh04]

void disp()
{
int i;
for(i=0;i <=top;i++)
cout < < buffer[i];
}

buffer是私有变量,st.buffer不能直接访问

[jia_xiaoxin]

#include <iostream> 
using namespace std; 
class A 
{ 
	int top; 
	int buffer[100]; 
public: 
	A() {top=-1;} 
	bool push(int i) 
	{ 
		if(top==100-1) 
		{ 
			cout <<"stack is overflow.\n"; 
			return false; 
		} 
		else 
		{ 
			top++; 
			buffer[top]=i; 
			return true; 
		} 
	} 
public: 
	void disp(int bufferd[]) 
	{ 
		int i; 
		for(i=0;i <=top;i++) 
			cout << bufferd[i]; 
	} 
}; //此处未加;
int main() 
{ 
	int x; 
	A st; 
    cin >> x; 
	st.push(x); 
	st.disp(st.buffer); //buffer被定义成私有成员函数，所以在此处不能调用
    return 1; 
} 

[phz1985]

要细心

#include <iostream>
using namespace std;
class A
{
	int top;
	int buffer[100];
public:
	A() {top=-1;}
	bool push(int i)
	{
		if(top==100-1)
		{
			cout <<"stack is overflow.\n";
			return false;
		}
		else
		{
			top++;
			buffer[top]=i;
			return true;
		}
	}
public:
	void disp()
	{
		int i;
		for(i=0;i <=this->top;i++)
			cout << this->buffer[i];//
	}
};//
int main()
{
	int x;
	A st;
	cin >> x;
	st.push(x);
	st.disp();
	return 0;//
}