example for someone on discord

main.cpp

#include <iostream>
#include "SomeClass.h"

int main()
{
	SomeClass some;
	std::cout << some.addTen(10) << std::endl;
	some.doSomething();
}

SomeClass.cpp

#include "SomeClass.h"
#include <iostream>
// implementation

void SomeClass::doSomething()
{
	std::cout << "doing saomething" << std::endl;
}

int SomeClass::addTen(int from)
{
	return from + 10;
}

SomeClass.h

#pragma once
#include <vector>
// definition

class SomeClass
{
	std::vector<int> someNumbers;
public:
	void doSomething();
	int addTen(int from);
};