int main()
{
struct {
char ch2;
union {
char ch1;
char num;
} bbb;
}aaa;
aaa.ch2='a';
aaa.bbb.num='1';
cout<<aaa.ch2<<aaa.bbb.ch1<<aaa.bbb.num;//輸出爲 a 1 1
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int main()
{
struct {
char ch2;
union {
char ch1;
char num;
} bbb;
}aaa;
aaa.ch2='a';
aaa.bbb.num='1';aaa.bbb.ch1='b';
cout<<aaa.ch2<<aaa.bbb.ch1<<aaa.bbb.num;//輸出爲a b b
}
注:sizeof(bbb)=2
struct {
char ch2;
union {
char ch1;
int num;
} bbb;
}aaa;
aaa.ch2='a';
aaa.bbb.num=100;aaa.bbb.ch1='b';
cout<<aaa.ch2<<aaa.bbb.ch1<<aaa.bbb.num<<endl;// a b 98
cout<<sizeof(aaa); //8