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stack10828.cpp
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90 lines (86 loc) · 1.18 KB
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#include <iostream>
#include <string>
using namespace std;
// private(class 선언 시 default)
// public(struct 선언 시 default)
struct Stack
{
int data[10000];
int size;
Stack()
{ // 생성자
size = 0;
}
void push(int num)
{
data[size] = num;
size += 1;
}
bool empty()
{
if (size == 0)
{
return true;
}
else
return false;
}
int pop()
{
if (empty())
{
return -1;
}
else
{
size -= 1;
return data[size];
}
}
int top()
{
if (empty())
{
return -1;
}
else
{
return data[size - 1];
}
}
};
int main()
{
int n;
cin >> n;
Stack s;
while (n--)
{
string cmd;
cin >> cmd;
if (cmd == "push")
{
// cpp는 자료형을 중간에 선언할 수 있다.
int num;
cin >> num;
s.push(num);
}
else if (cmd == "top")
{
cout << (s.empty() ? -1 : s.top()) << '\n';
}
else if (cmd == "size")
{
cout << s.size << '\n';
}
else if (cmd == "pop")
{
cout << (s.empty() ? -1 : s.top()) << '\n';
if (!s.empty())
{
s.pop();
}
}
}
return 0;
}