How can I make XCode indent // characters when I set a line to commented? -

whenever indent lines of code in xcode, puts slash characters @ beginning of line, prior indentation.

before:

    if(0 == 0) {         nslog(@"some line of code");         nslog(@"another line of code");     } 

after:

    if(0 == 0) { //        nslog(@"some line of code");         nslog(@"another line of code");     } 

what want instead put "//" characters after indentation, other text editors on earth, this:

    if(0 == 0) {         //nslog(@"some line of code");         nslog(@"another line of code");     } 

how can make that?

1. "command [" until text attached left

2. add "//" (command /)

3. finally "command ]" original location.