public void doSomeWork(Prac4 prog)
{
prog.getFirstNumber();
prog.getSecondNumber();
prog.getOperator();
prog.performCalculation();
prog.displayResult();
doSomeWork(prog);
}
public static void Main4(string[] args)
{
Prac4 prog = new Prac4();
prog.doSomeWork(prog);
}