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Categories / C++ Tutorial / Operators Statements

 

Sizeof a union

#include<iostream.h> union u_tag{    int i;    double d; }u={88}; struct s_tag{     int i;        double d; }s={66,1.234}; int main() {     int size;        size=sizeof(union u_tag);     cout<<"sizeof(union u_tag)="<<size<<endl;     u.i=100;        cout<<"u.i="<<u.i<<endl;        u.d=1.2345;        cout<<"u.d="<<u.d<<endl;        size=sizeof(u.d);        cout<<"sizeof(u.d)="<<size<<endl;        cout<<"s.i="<<s.i<<endl;        cout<<"s.d="<<s.d<<endl;        size=sizeof(struct s_tag);        cout<<"sizeof(struct s_tag)="<<size<<endl; } sizeof(union u_tag)=8 u.i=100 u.d=1.2345 sizeof(u.d)=8 s.i=66 s.d=1.234 sizeof(struct s_tag)=16