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pkv314
pkv314
Last Activity: Mar 21 '13, 07:13 AM
Joined: Mar 12 '13
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  • pkv314
    replied to const variable in C++ can be changed using aliases
    in C
    Compiler specific



    Thank you. Yes, this is TOTALLY compiler specific. I have compiled this code with icc, g++ (under Unix), and Dev-C++ (under Windows). All of these compilers generate code which prints 3.1415926 (i.e. alias variable and explicit casting do not change the const variable). Compilers create two INDEPENDENT variables pi=3.1415926 and pi_copy=4.0. I was thinking about migration to Dev_C++, but it has some...
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    • pkv314
      started a topic const variable in C++ can be changed using aliases
      in C

      const variable in C++ can be changed using aliases

      Hello.
      const qualifier is usually posed as better alternative to #define (because it allows to check types). The simple program shows how const variable can be changed in C++

      Code:
      const double pi = 3.1415926;
	double& pi_copy = (double&)pi;
	pi_copy = 4.0;
	cout << pi << endl;
      Result of printing of pi will be 4. I used Visual C++ 2010 under Windows XP.

      As far...
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      Last edited by weaknessforcats; Mar 12 '13, 07:55 PM. Reason: added code tags
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