declare size of vector while declaring code example
Example 1: how to create a vector in c++
// First include the vector library:
#include <vector>
// The syntax to create a vector looks like this:
std::vector<type> name;
// We can create & initialize "lol" vector with specific values:
std::vector<double> lol = {66.666, -420.69};
// it would look like this: 66.666 | -420.69
Example 2: 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. */