Question

I run below code in vc.

 system("@echo off");
 system("set a=3");
 system("echo %a%");
 system("pause");

but it display as ‘%a%’, but I require display as ‘3’.

How Can I make it?
Thanks very much for your help.

Answer 1

Create the “tmp.bat” file:

@echo off
set a=3
echo %a%
pause

and then call the

system("cmd /c tmp.bat")

The thing is that system() call creates a “clean” environment where the “a” variable has not been set (in the “echo %a%” call).

To convert the sequence of commands into something “executable” one might use some special tool, not the “VC”.

Look for http://www.autoitscript.com/site/autoit/ and similar tools.