colon

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hi guys today my first sem computer exams got over. one question in paper was WHAT IS A NULL STATEMENT? how it is useful? can some1 tel me the ans. i wrote a statement followed by double semi colon where second semi colon acts like a null statement. m i right? koi to batao bhai log

Sometimes H colon for DVD-ROM appears after I click the Computer and sometimes not. Moreover, sometimes when I put a DVD CD and click H colon, the H colon disappears and the DVD CD does not run. What is actually the problem and how to rectify it?