Re: vector problem
"arnuld" <geek.arnuld@gmail.com> wrote in message
news:87abtoj2lu.fsf@gmail.com...
peter koch <peter.koch.larsen@gmail.com> writes:
On 21 Jul., 16:41, arnuld <geek.arn...@gmail.com> wrote:
[...SNIP...]
const int v_size = 6;
std::vector<int> ivec(v_size); /* now, i can add any number of
elelemnts :) */
No. You now have a vector with six elements, all being zero.
i can not add more elements ?
yes, you can, just by using ivec.push_back();
But when you use push_back() it just adds it to the end, no reason to worry
about an iterator. I.E.
int begin_element = 10;
for ( int i = begin_element; i < begin_element + 6; ++i )
ivec.push_back( i );
this would push 10, 11, 12, 13, 14, 15 into the vector. With your prevoius
sizing, your vector would wind up being:
0, 0, 0, 0, 0, 0, 10, 11, 12, 13, 14, 15
/home/arnuld/programming/cpp $ g++ -ansi -pedantic -Wall -Wextra
test.cpp
test.cpp: In function 'int main()':
test.cpp:14: error: void value not ignored as it ought to be
Please annotate the source code with the error message so we won't
have to count lines (which can be difficult when we need to guess e.g.
the word-wrap that occured).
i apologize for causing the trouble. nobosy ever complained that, youa
re the 1st one. from now i will put my a comment on the line where the
error happened e.g. i will add "this is line number 14, error occured
here". BTW, it is really quite cumbersome to find out the line #14 in
soemone else's code.
So, in summary, if you want to change an element, dereference the pointer.
*it = someval;
if you want to add a new element, use pushback
ivec.push_back( someval );