programming.h

class Programming
{
private:
	int variable;
public:
	void Input_value();
	void Output_value();
};

programming.cpp

#include "programming.h"
#include<iostream> 
using namespace std;
void Programming::Input_value()
{
	cout << "Zadaj cislo :\n";
	cin >> variable;
}
 
void Programming::Output_value()
{
	cout << "Bolo zadane cislo ";
	cout << variable << "\n";
}

main.cpp

#include "programming.h"
int main()
{
	Programming object;
 
	object.Input_value();
	object.Output_value();
 
	return 0;
}

Output:

Zadaj cislo :
22
Bolo zadane cislo 22