c++17(25)-union
#include <iostream>#include <string.h>using namespace std;union Nums{int x;double y;char z;};int main(int argc, char **argv){Nums a;a.y=1.9238;cout<<a.y<<endl;a.x=18;cout<&l
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#include <iostream>
#include <string.h>
using namespace std;
union Nums{
int x;
double y;
char z;
};
int main(int argc, char **argv)
{
Nums a;
a.y=1.9238;
cout<<a.y<<endl;
a.x=18;
cout<<a.x<<endl;
a.z='a';
cout<<a.z<<endl;
return 0;
}
所有union地址一样,共享一个内存空间,空间大小为union成员中最大占用空间
#include <iostream>
#include <string.h>
using namespace std;
union Nums{
int x;
double y;
char z;
};
int main(int argc, char **argv)
{
Nums a;
a.y=1.9238;
cout<<a.y<<endl;
a.x=18;
cout<<a.x<<endl;
a.z='a';
cout<<a.z<<endl;
return 0;
}
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