java - 代码重构作业？

Question

这是我必须为作业重构的代码:

if (state == TEXAS) {
    rate = TX_RATE;
    amt = base * TX_RATE;
    calc = 2 * basis(amt) + extra(amt) * 1.05;
} else if ((state == OHIO) || (state == MAINE)) {
    rate = (state == OHIO) ? OH_RATE : MN_RATE;
    amt = base * rate;
    calc = 2 * basis(amt) + extra(amt) * 1.05;
    if (state == OHIO)
        points = 2;
} else {
    rate = 1;
    amt = base;
    calc = 2 * basis(amt) + extra(amt) * 1.05;
}

我做过这样的事

if (state == TEXAS) {
    rate = TX_RATE;
    calculation(rate);
} 
else if ((state == OHIO) || (state == MAINE))
    {
rate = (state == OHIO) ? OH_RATE : MN_RATE;

calculation(rate);

if (state == OHIO)
    points = 2;
}

else {
    rate = 1;
    calculation(rate);
}

function calculation(rate)
{
    amt = base * rate;
    calc = 2 * basis(amt) + extra(amt) * 1.05;
}

我怎样才能做得更好？
编辑 我已完成代码编辑amt = base * rate;

Answer 1

class State {
private :
  double taxRate;
  int baseWeight;
  int extraWeight;
  string name;
  base;
public:
  State(string name, double taxRate = 1, int point =0, double baseWeight=2, double extraWeight=1.05); //implement the method yourself
  double extra(double base);
  double basis(double base);
  double calculate(double base){
      return baseWeight * basis(base) + baseWeight * extra(base);
  }
  int point(){return point};

};

现在如何使用它:

State ohio ("OHIO", OH_RATE, 2);
cout << "OHIO result:" ohio.calculate() << " point:" << ohio.point() << endl;