C++ UNION的问题

#include <cstdlib>
#include <iostream>
#include <cmath>

using namespace std;

union SAMPLE
{
int x;
char y;
double z;
};

int main(int argc, char *argv[])
{
SAMPLE sample;
sample.z = 0;
sample.x = 65;
cout<<"x = "<<sample.x<<" y = "<<sample.y<<" z = "<<sample.z<<endl;
sample.z = 5*pow(2.,32);
cout<<"x = "<<sample.x<<" y = "<<sample.y<<" z = "<<sample.z<<endl;
sample.y='D';
cout<<"x = "<<sample.x<<" y = "<<sample.y<<" z = "<<sample.z<<endl;
system("PAUSE");
return EXIT_SUCCESS;
}
//*****输出**************
x = 65 y = A z = 3.21143e-322
x = 0 y =

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