A Test of Struct & Access Modifiers in C++

#include <iostream>
#include <stdlib.h>
using namespace std;

class CClass
{
    int CClassInt=1;
};

class CClass2 : CClass
{
public:
    int returnCClassInt()
    {
        return CClassInt;
    }
};

int main()
{
    CClass2 ccl1;

    cout << "CClassInt=" << ccl1.CClassInt() << '\n';

    //system("pause");
    return 0;
}

/************************************** Compiler Output **************************************
|7|warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11 [enabled by default]|
||In member function ‘int CClass2::returnCClassInt()’:|
|7|error: ‘int CClass::CClassInt’ is private|
|15|error: within this context|
||In function ‘int main()’:|
|7|error: ‘int CClass::CClassInt’ is private|
|23|error: within this context|
|23|error: expression cannot be used as a function|
||=== Build failed: 5 error(s), 1 warning(s) (0 minute(s), 0 second(s)) ===|
************************************** Compiler Output **************************************/