classes in header file c 2b 2b example

1//headers 
2#ifndef TOOLS_hpp 
3#define TOOLS_hpp
4#include<vector> 
5#include<iostream>
6#include<fstream>
7#include<string>
8using std::ifstream;
9using std::cout; 
10using std::cin;
11using std::endl;
12using std::cerr;
13using std::vector;
14using std::string;
15// functions prototypes 
16inline vector<int> merge(const vector<int>&a,const vector<int>& b);//merge function prototype with Formal Parameters 
17std::vector<int> sort(size_t start, size_t length, const std::vector<int>& vec);//sort function prototype with formal parameters 
18#endif
19

1class Date
2{
3private:
4    int m_year;
5    int m_month;
6    int m_day;
7
8public:
9    Date(int year, int month, int day)
10    {
11        setDate(year, month, day);
12    }
13
14    void setDate(int year, int month, int day)
15    {
16        m_year = year;
17        m_month = month;
18        m_day = day;
19    }
20
21    int getYear() { return m_year; }
22    int getMonth() { return m_month; }
23    int getDay()  { return m_day; }
24};
25