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#include <iostream>  // std::cout, std::endl
#include <vector>    // std::vector

using std::cout;
using std::endl;
using std::vector;

int main() {
    vector<double> v{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 };
 
    int result = size(v);

    cout << "length: " << result << endl;

	return 0;
}

//> length: 20