can we change the value of constant variable thru pointers...?

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~~pls send me ans as soon as possible..~~

Thanks in advance for your answers

Posted 10-Mar-12 21:26pm

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Updated 11-Mar-12 1:55am

Nelek

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OriginalGriff · Answer 1 · 2012-03-10T22:02:00

Under some circumstances, and depending on the variable, and the system you are running on, and the specific compiler, then yes, you can. But it is strongly recommended that you don't.

What part of constant is troubling you?

Constants should be treated as just that: values which do not change. Any change in constant values leads to code that is hard to maintain, hard to understand, and generally not worth keeping.

There are almost certainly better way to handle whatever your problem is: look for them instead.

Sergey Alexandrovich Kryukov · Answer 2 · 2012-03-10T22:00:00

For C (as opposed to C++), this is explained here:
http://publications.gbdirect.co.uk/c_book/chapter8/const_and_volatile.html[^].

In particular, please see Example 3.8 in the article referenced above. Usually, casting to a non-constant pointer is a bad thing, a sign of wrong code design, should be used with great care where it is really unavoidable.

Just in case: in C++, there is a template cast called const_cast<>. Please see:
http://www.cplusplus.com/doc/tutorial/typecasting/[^].

—SA

can we change the value of constant variable thru pointers...?

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