Массив структур

#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
struct Node{
    string firstName;
    string lastName;
    string phoneNum;
    int birthDay[3];
};
 
int main()
{
    Node peop[8];
    int Month=0;
    cout << "Example: Ivanov Ivan 8-800-020202 01.01.1001" << endl;
    for(int i=0;i<8;++i){
 
        cout << "Enter data " << i+1 << ": ";
        cin>>peop[i].lastName >> peop[i].firstName >> peop[i].phoneNum;
        cin>>peop[i].birthDay[0]; cin.ignore();
        cin>>peop[i].birthDay[1]; cin.ignore();
        cin>>peop[i].birthDay[2]; cin.ignore();
    }
    cout << endl;
 
 
    cout << "Enter month number: ";
    cin >> Month;
 
    cout << Month;
    for(int i=0;i<8;++i){
        if (peop[i].birthDay[1] == Month){
            cout<< peop[i].lastName << " "<<peop[i].firstName << " " << peop[i].phoneNum << " ";
            cout << peop[i].birthDay[0] << ".";
            cout << peop[i].birthDay[1] << ".";
            cout << peop[i].birthDay[2] << endl;
        }
    }
    cin.get();
    return 0;
}

int i;
for(i=0;i<8;++i){