declare vectors c++
vector<int> vec;
//Creates an empty (size 0) vector
vector<int> vec(4);
//Creates a vector with 4 elements.
/*Each element is initialised to zero.
If this were a vector of strings, each
string would be empty. */
vector<int> vec(4, 42);
/*Creates a vector with 4 elements.
Each element is initialised to 42. */
vector<int> vec(4, 42);
vector<int> vec2(vec);
/*The second line creates a new vector, copying each element from the
vec into vec2. */how to use vectors c++
#include <iostream>
#include <vector>
using namespace std;
int main() {
//vector element size
const int size = 4;
//vector with int data type
//all elements are equal to 4
vector<int> myVect (size, 4);
for (int i=0; i<size; i++) {
cout << "Vector index(" << i <<") is: "<< myVect[i] << endl;
}
return 0;
}vectors in c++
vector <int> vc;Copyright © 2021 Codeinu
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