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#include <iostream>
 
class Example {
    private:
        int a;
    public:
        int getA() { return a; }
 
        // Example class is immutable unless we add a setter method
        // bool setA(int a2) {
        // 	if (a2 < 100 && a2 >= 0) {
        // 		a = a2;
        // 		return true;
        // 	} else {
        // 		return false;
        // 	}
        // }
};
 
int main() {
	Example e;
 
	std::cout << "e.a is " << e.a << std::endl;
 
	e.a = 10;
 
	// int n = -10;
	// if (e.setA(n)) {
	// 	std::cout << "e.a is now " << e.getA() << std::endl;
	// } else {
	// 	std::cout << "Could not set e.a to " << n << std::endl;
	// }
}

prog.cpp: In function ‘int main()’:
prog.cpp:23:30: error: ‘int Example::a’ is private within this context
  std::cout << "e.a is " << e.a << std::endl;
                              ^
prog.cpp:5:13: note: declared private here
         int a;
             ^
prog.cpp:25:4: error: ‘int Example::a’ is private within this context
  e.a = 10;
    ^
prog.cpp:5:13: note: declared private here
         int a;
             ^

Standard output is empty