How show ? you mean with DrawText() ?
DrawText(1,1, "My string: %s, My Number: %d", mystring,mynum);
http://www.leadwerks.com/wiki/index.php?title=DrawText
if you need know another %X parameters, just go there http://cplusplus.com/reference/clibrary/cstdio/printf/
good c++ documentation is there http://cplusplus.com/doc/tutorial/