union_02.cpp

来自「数据结构常用算法合集」· C++ 代码 · 共 30 行

//union_02.cpp
#include <iostream.h>		//cin,cout
#include <iomanip.h>		//setw()
#include <conio.h>		//getch()
union u_rec				//公共union
{ int x;
  short a;
  char ch;
}u_var={0x41424344};
void output_data(u_rec *);
void main()
{
  cout <<"原始值:\n";
  cout <<"  16进      10进";
  output_data(&u_var);		//传地址给指针
  cout <<"\n设置a后值:";
  u_var.a =0x4241;		//Hex
  output_data(&u_var);
  cout <<"\n设置ch后值:";
  u_var.ch='C';
  output_data(&u_var);
  getch();
}
//output_data
void output_data(u_rec *a)
{ cout <<"\nx ="<<setw(8)<<hex<<a->x <<" "<<dec<<a->x;
  cout <<"\na ="<<setw(8)<<hex<<a->a<<" "<<dec<<a->a;
  cout <<"\nch="<<a->ch<<endl;
}