Macro Expansion Proposal

[sebetci]

Hi @AndrewLaing,

I ran into a problem when I compile and run the Simpletron application in the ex07_28.c file on the Windows 10 operating system. Since I was compiling with GCC using Cygwin, I noticed that the following system command defined in the program was causing the error.

Click to see the relevant source code line in ex11_17v2.c.

    #define PAUSE system( "pause" )
    #define CLEARSCREEN system( "cls" )

I had the same situation when I was running the ex11_17 project; the operating system warned that it could not find the specified system command. To solve this problem on POSIX systems, Windows-based operating systems and Linux distribution operating systems using Cygwin, I have extended the macros you use in the program as follows:

Click to see recommended source code.

#if defined( _POSIX_VERSION )
	#define CLEARSCREEN system( "clear" )
	#define PAUSE       system( "read -n1 -r -p \"Press any key to continue...\" ")
#elif ( defined( __unix__ ) || defined( __linux__ ) )
	#define CLEARSCREEN system( "clear" )
	#define PAUSE       system( "read -n1 -r -p \"Press any key to continue...\" ")
#elif ( defined( _WIN64 ) || defined( _WIN64 ) )
	#define CLEARSCREEN system( "cls" )
	#define PAUSE       system( "pause" )
#endif

I searched for the equivalent of the pause system command in DOS. I found out that there is no pause command directly in the shell. Instead, I learned that the read command is used as follows:

$ read -n1 -r -p "Press any key to continue..."

Thank you for your contributions to the community. I wish you good work.