how do i convert t[i-3] and t[i-1] into an addable value? For example: i = 3, 3 % 2 != 0, cout<<3<<” “<<t[3-1] % 7 (so -> 1 % 7 = 1)<<endl;

#include <iostream>

using namespace std;

int main(){
    int i = 0;
    int t[i];
    cout<<"i"<<"   "<<"t[i]"<<endl; //headers
    for (i;i < 11;i++){
        if (i < 3){
            t[i] = 1;
            cout<<i<<"   "<<t[i]<endl;
                    
        }
        if (i >= 3){
            if (i % 2 == 0){
                cout<<i<<"   "<<"t[i-3] + t[i-1] + 1"<<endl;
            }
            else
                cout<<i<<"   "<<"t[i-1] % 7"<<endl;
        }
    }
    return 0;
}

i want this code to be as simple as it can be (cmath could be used if needed)

i TRIED to implement an additional variable for counting the highest number but could not figure out how to tie it together.