Write a simple class that uses with a private variable and a public member function.

SimpleClass.cpp

// https://repl.it/LECL

#include <iostream>
using namespace std;

class SimpleClass
{
  private:
    string privateStr;
  public:
    void setPrivateStr(string text);
    void printPrivateStr();
};

void SimpleClass::setPrivateStr(string text)
{
  privateStr = text;
}

void SimpleClass::printPrivateStr()
{
  cout << "privateStr is " + privateStr;
}

int main()
{
  SimpleClass sc;
  
  sc.setPrivateStr("yo\n");
  sc.printPrivateStr();
  
  return 0;
}