#include<iostream>
int main()
{
    using namespace std;
    union value
    {
        int a;
        float b;
        char c;
    }data;
    cout<<"sizeof(data):"<<sizeof(data)<<endl;
    data.c='a';
    cout<<data.c<<endl;
    data.b=1.3;
    cout<<data.b<<endl<<data.a<<endl;
    
}