hour21_3.txt

来自「《24学时精通c++》的随书源码的下半部分。欢迎下载学习。」· 文本 代码 · 共 6 行

In most cases, the command line option to define a macro variable is -D variable=value 

If you leave off "=value" then a value of 1 is usually assumed.

Your compiler may be different. Check the help!