macrosideeffects.cpp

Thinking In C++ 第二版 随书配套代码

//: C09:MacroSideEffects.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
#include "../require.h"
#include <fstream>
using namespace std;

#define BAND(x) (((x)>5 && (x)<10) ? (x) : 0)

int main() {
  ofstream out("macro.out");
  assure(out, "macro.out");
  for(int i = 4; i < 11; i++) {
    int a = i;
    out << "a = " << a << endl << '\t';
    out << "BAND(++a)=" << BAND(++a) << endl;
    out << "\t a = " << a << endl;
  }
} ///:~