see by writting some code ideas choose that code &lifier press control + K which code now prints in different things format.

printf("this really is code")

see now i copy uper sentences code &lifier paste it below in control+ k mode

printf("this is code"); 

okey now i wish to know how do i get same effect during my wordpress-blog's publish?

any wordpress plugin or any technique or any html tag ?

It appears as if you are searching for a Wordpress wordpress plugin which could handle source code syntax highlighting. Here are a few good examples which might meet your needs:

http://wordpress.org/extend/plugins/wp-syntax/screenshots/

http://wordpress.org/extend/plugins/google-syntax-highlighter/screenshots/

You will want a code highlighter. For WordPress, Geshi-backed highlighters are pretty common. http://wordpress.org/extend/plugins/tags/geshi

You will be searching for the <pre> tag.