printingvalues.cpp

来自「《24学时精通c++》的光盘内容」· C++ 代码 · 共 28 行

 // Listing 21.5 - Printing values in DEBUG mode
 #include <iostream>
 #define DEBUG

 #ifndef DEBUG
 #define PRINT(x)
 #else
 #define PRINT(x) \
     std::cout << #x << ":\t" << x << std::endl;
 #endif

 int main()
 {
     int x = 5;
     long y = 73898l;
     PRINT(x);
     for (int i = 0; i < x; i++)
     {
         PRINT(i);
     }

     PRINT (y);
     PRINT("Hi.");
     int *px = &x;
     PRINT(px);
     PRINT (*px);
     return 0;
 }