Is there someone here who can use a for loop for vectors?

Question

I have a vector with 5 elements inside. vector <double> v (5). I would like to say that each element has a value of 1.2. Is it possible to say for (auto& element : v) { element = 1.2} ?

Answer 1

why not?

or vector<double> v(5, 1.2);

Answer 2

Both works.

vector<double> v(5);
//this works:
for (auto& element : v) {
element = 1.2;
}
//this also works:
v = vector<double>(5, 1.2);
//yet another alternative
int i;
for(i = 0; i < 5; i++){
v[i] = 1.2;
}
//a last one (requires <algorithm>)
fill(v.begin(), v.end(), 1.2);

//printing the vector
vector<double>::iterator it = v.begin();
while (it != v.end()) {
cout << *it << endl;
it++;
}

Answer 3

Or maybe I have to say tab = vector <double>(tab.size (), 1.2); ?

Answer 4

Thanks! Another question when should I use vector more than an array? Because I can see anything in Solo Learn courses about vectors...