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){
        if(s>20) size = 20;
        else if(s<1) size = 1;
        else size = s;
        writeIndex = 0;
        for(int i=0; i<20;i++){
            buffer[i] = 0;
        }
    }

    void push(int v);
    void print();
};

void DataBuffer::push(int v){
    if(writeIndex < size){
        buffer[writeIndex] = v;
        writeIndex++;
    }
}

void DataBuffer::print(){
    for(int i=0; i<writeIndex; i++){
        cout << buffer[i] << " ";
    }
    cout << endl;
}

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;
}