In this code how output is 65?

Question

#include <iostream>
using namespace std;

int main() {
union data
{
int i;
unsigned c;
}data;
data.i=89;
data.c='A';
cout<<data.i;
return 0;
}

Answer 1

union is memory area, that stores all its members, but it's is size of biggest member. int and unsigned int have same size, so I and c take same memory area and if c changed i changed too.

Answer 2

Try change c to 4 000 000 000 and look at I. It should wonder you. But that value depends on your compiler.