3.1.7.1 Counting operations

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

struct Find
{
	unsigned v1,v2;
	Find(unsigned vv1,unsigned vv2){
		v1 = vv1;
		v2 = vv2;
	}

	bool operator()(const double & v)
	{
		return (v >= double(v1) && v <= double(v2));
	}
};



int main()
{
	vector<double> values ={ 2.1, 3.14, 2.2, 1.1, 2.11, 3.2, 3.6, 2.5, 2.6, 4.11, 4.12, 3.11, 3.73, 4.83 };
	unsigned start_value;
	cin >> start_value;
	unsigned stop_value;
	cin >> stop_value;


	unsigned int number;

	number = count_if(values.begin(), values.end(),Find(start_value,stop_value));

	cout << number << endl;

	system("pause");
	return 0;
}