memleak.cpp

#include <iostream>
#include <cmath>

int main()
{
    using namespace std;

    long long a[20] = {*a};
    int i = 1;

    while (i > 0)
    {    
        a[i] = pow(2, 16) - 1; 
        cout << "a[" << i << "] <" << &a[i] << ">: " << a[i] << endl;
        
        i++;
    }

    return 0;
}

output

$ g++ memleak.cpp -o memleak
$ ./memleak
a[1] <0x7fff279b9468>: 65535
a[2] <0x7fff279b9470>: 65535
...
a[19] <0x7fff279b94f8>: 65535
a[20] <0x7fff279b9500>: 65535
a[0] <0x7fff279b9460>: 0
a[1] <0x7fff279b9468>: 65535
a[2] <0x7fff279b9470>: 65535
a[3] <0x7fff279b9478>: 65535
...