I'm trying to change the values of a vector by doing something similar to the following function:
vector<int> Question2_Part3(vector<int> &v){
for(auto elem : v){
elem *= 2;
cout << elem << " ";
}
cout << "\n" << endl;
return v;
}
Is this possible? I know that in my for loop, it is the value of elem
that is changing. Can I have the same output while also changing the values in v
and still use a range-based for loop?
Yes it is possible but use a reference
for (auto &elem : v) {
elem *= 2;
cout << elem << " ";
}
This is also more efficient as it avoids copying each vector element to a variable. Actually if you didn't want to change the elements you should do
for (const auto &elem : v) {
cout << elem << " ";
}
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