DataBuffer Fixed Buffer Init

#include <iostream>
using namespace std;

// Write your DataBuffer class here
class DataBuffer{
    int size;
    int buffer[20];
    int writeIndex;

    public:
        DataBuffer(int s): writeIndex(0){
            if(s<1) size = 1;
            else if(s>20) size=20;
            else size = s;
            for(int i = 0; i < 20; i++){
                buffer[i] = 0;
            }
        }
        void push(int v){
            if(writeIndex<size){
                buffer[writeIndex] = v;
                writeIndex++;
            }
        }
        void print(){
            for(int i = 0; i < writeIndex; i++){
                cout<<buffer[i]<<" ";
            }
        }
};

int main() {
    int s, n;
    cin >> s >> n;

    DataBuffer buf(s);

    for (int i = 0; i < n; i++) {
        int x;
        cin >> x;
        buf.push(x);
    }

    buf.print();
    return 0;
}