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Scoping in for loop

Discussion in 'C' started by Dimesh, Jul 25, 2010.

  1. Dimesh

    Dimesh New Member

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    Al salamo Alykom

    And hi..
    Thank you for reading my topic
    ------------------------------

    After building this code:

    Code:
    #include<iostream>
    
    	using namespace std;
    
    	int main()
    	{
    		for(int i=0; i<5 ; i++)
    		{
    			cout << "i:" << i << endl;
    		}
    		i = 7;
    		return 0;
    	}
    I found this problem :
    i read that the problem means my compiler does not support this aspect of the ANSI standard...
    what is meant by that and how can i make my compiler support or not ?!


    **** Build of configuration Debug for project Linux_Xp_Learning ****

    make all
    Building file: ../scoped_for_loop.cpp
    Invoking: GCC C++ Compiler
    g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"scoped_for_loop.d" -MT"scoped_for_loop.d" -o"scoped_for_loop.o" "../scoped_for_loop.cpp"
    ../scoped_for_loop.cpp: In function ‘int main()’:
    ../scoped_for_loop.cpp:19: error: name lookup of ‘i’ changed for ISO ‘for’ scoping
    ../scoped_for_loop.cpp:19: note: (if you use ‘-fpermissive’ G++ will accept your code)
    make: *** [scoped_for_loop.o] Error 1
     
  2. Ancient Dragon

    Ancient Dragon New Member

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    That is not ansi standard. If you originally wrote that using VC++ 6.0 compiler it worked because that was a non-standard c++ compiler. Microsoft has since changed their ways and made vc++ 2010 much more ansi standard compliant.

    >>how can i make my compiler support or not
    Your compiler IS supporting ansi standard -- it was the code you posted that was not ansi standard compliant, not the compiler.
     
  3. Ancient Dragon

    Ancient Dragon New Member

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    One way to make your code correct is to declare variable i outside and above the loop, very much linke C programs do
    Code:
    int main()
    {
       int i;
       for(i = 0; i < 5; i++)
       {
          // blabla
       }
       i = 0;
    }
    
     
    Last edited: Jul 25, 2010

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