Purpose of Header guards

Posted by viswanathan on Stack Overflow See other posts from Stack Overflow or by viswanathan
Published on 2010-06-05T06:15:00Z Indexed on 2010/06/05 6:22 UTC
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In C++ what is the purpose of header guard in C++ program.

From net i found that is for preventing including files again and again but how do header guard guarantee this.

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