int number1 = 30;
 int number2 = 50;
 int* ref = &number1;

 cout << number1 << endl;
 cout << number2 << endl;
 cout << endl;


 cout << *ref << endl;
 cout << (*ref+=5) << endl;
 cout << number1 << endl;

 cout << endl;


 ref = &number2;
 cout << *ref << endl;
 cout << number2 << endl;
 cout << (number2+=100) << endl;
 cout << number2 << endl;
 cout << *ref << endl;


요래하면 원하는 결과값 얻을 수 있을겁니다