Why in first case, value of "i" is 8, but in second case, value is 0? I only made a declaration of variable "i"? Does anyone kno

Question

Case 1:

#include <iostream>
using namespace std;

int main() {

int x = 2;
int i; // i = 0
cout << i << endl;

return 0;
}

#Output: 8

Case 2:

#include <iostream>
using namespace std;

int main() {

int x = 2;
int y = 10;
int i; // i = 0
cout << i << endl;

return 0;
}

#Output: 0

Answer 1

If you don't initialize a variable he get a random value.

Answer 2

Global variables initialized to 0 by default.
Local variables are not initialized. So they will have the garbage value (i. e. Random value), which can not be predicted.