union2.cpp

来自「Thinking_in_C___2.rar」· C++ 代码 · 共 24 行

//: C03:Union2.cpp
// From Thinking in C++, 2nd Edition
// at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
//  Unions with constructors and member functions

union U {
  int i;
  float f;
  U(int a) { i = a; }
  U(float b) { f = b;}
  ~U() { f = 0; }
  int read_int() { return i; }
  float read_float() { return f; }
};

int main() {
  U X(12), Y(1.9F);
  X.i = 44;
  X.read_int();
  Y.read_float();
} ///:~