What did I do wrong with the declaration part ??

Question

It says ‘i’ was not declared in this scope
And
‘a’ was not declared in this scope

#include <iostream>
using namespace std;

int main() {
int a[i]={};
while(cin>>a[i]){
cout<< a[i];
}
return 0;
}

Answer 1

Well, there is nowhere a variable 'i' to be found, so of course it says it is not declared. As a result, the declaration of 'a' is faulty aswell.