how we use single pin in any port by using c program for 89s51
But they still aren't the correct tags for use on this forum!
The correct tags to use are very clearly stated directly above the message entry box:
www.danlhenry.com/.../keil_code.png
If that's not clear enough, there is also a link to further "Tips for Posting Messages" http://www.keil.com/forum/tips.asp
And the 'Preview' will clearly show whether or not you've got it right.
Anyone who really can't get this right after 3 attempts is clearly either having a laugh, or totally unsuited to any kind of programming! Maybe both...