What's the reason for these errors

vivekc++ · #1 11-Feb-2009, 08:51

CPP / C++ / C Code:

#include<iostream>
#include<list>

using namespace std;
                  
int main()
{
  list<int> dob;
    
   for(int i=0;i<5;i++)
   {
      dob.push_back(i);
   }   
  

   for(int i=0,list<int>::iterator itr=dob.begin();i<3;itr++,i++)
     cout<<*itr; 

 return 0;
}

errors--

Code:

test.cpp: In function `int main ()':
test.cpp:17: `iterator' specified as declarator-id
test.cpp:17: extraneous `int' ignored
test.cpp:17: `int list<int, allocator<int> >::iterator' is not a static
member of `class list<int, allocator<int> >'
test.cpp:17: parse error before `='
test.cpp:17: `itr' undeclared (first use this function)
test.cpp:17: (Each undeclared identifier is reported only once for each
function it appears in.)

davekw7x · #2 11-Feb-2009, 13:05

Quote:

Originally Posted by vivekc++

CPP / C++ / C Code:


   for(int i=0,list<int>::iterator itr=dob.begin();i<3;itr++,i++)

This is trying todeclare itr to be an "int list<int>::iterator" data type.

If you are going to have multiple starting values in the for statement, and they are not the same type, don't try to declare them in the for statement. You could do something like

CPP / C++ / C Code:

   list<int>::iterator itr;
   int i;
   for(i = 0, itr = dob.begin(); i < 3; i++, itr++)
.
.
.

(In general, I would probably put in a test to make sure the iterator doesn't go beyond the end of the list:

CPP / C++ / C Code:

   for(i = 0,itr = dob.begin(); (i < how_many_you_want) && (itr != dob.end()); itr++)

Regards,

Dave

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What's the reason for these errors

Re: What's the reason for these errors