Regardless of how do you index the pushbacks your vector contains 10 elements indexed from 0
(0
, 1
, …, 9
). So in your second loop v[j]
is invalid, when j
is 10
.
This will fix the error:
for(int j = 9;j >= 0;--j) { cout << v[j]; }
In general it’s better to think about indexes as 0
based, so I suggest you change also your first loop to this:
for(int i = 0;i < 10;++i) { v.push_back(i); }
Also, to access the elements of a container, the idiomatic approach is to use iterators (in this case: a reverse iterator):
for (vector<int>::reverse_iterator i = v.rbegin(); i != v.rend(); ++i) { std::cout << *i << std::endl; }
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