public static Operation CreateOperation(string type)
{
Operation oper = null;
switch (type)
{
case "+":
oper = new Add();
break;
case "-":
oper = new Sub();
break;
case "*":
oper = new Mul();
break;
case "/":
oper = new Div();
break;
default:
throw new Exception("运算符号错误");
}
return(oper);
}
private void btnNigual_Click(object sender, EventArgs e)
{
segundo = double.Parse(txtScreen.Text);
double Sum;
double Res;
double Div;
double Mul;
switch (operador)
{
case "+":
Sum = obj.Sumar((primero), (segundo));
txtScreen.Text = Sum.ToString();
break;
case "-":
Res = obj2.Restar((primero), (segundo));
txtScreen.Text = Res.ToString();
break;
case "*":
Mul = obj3.Multiplicar((primero), (segundo));
txtScreen.Text = Mul.ToString();
break;
case "/":
Div = obj4.Dividir((primero), (segundo));
txtScreen.Text = Div.ToString();
break;
}
}
public Operation createOperate(string operate)
{
Operation oper = null;
switch (operate)
{
case "+":
oper = new Add();
break;
case "-":
oper = new Sub();
break;
case "*":
oper = new Mul();
break;
case "/":
oper = new Div();
break;
default:
break;
}
return(oper);
}
public static double Sub(string s)
{
int index = 0;
var v = Mul.Div(s, ref index);
while (index < s.Length)
{
if (s[index] == '+')
{
index++;
v += Mul.Div(s, ref index);
}
else if (s[index] == '-')
{
index++;
v -= Mul.Div(s, ref index);
}
else
{
Console.WriteLine("Error!");
}
}
return(v);
}
private void BtnIgual_Click(object sender, EventArgs e)
{
try
{
segundo = double.Parse(TxtEntry.Text);
}
catch (FormatException)
{
}
double Sum;
double Res;
double Mul;
double Div;
switch (operador)
{
case "+":
Sum = suma.Sumar(primero, segundo);
TxtEntry.Text = Sum.ToString();
break;
case "-":
Res = resta.Restar(primero, segundo);
TxtEntry.Text = Res.ToString();
break;
case "*":
Mul = mult.Multiplicar(primero, segundo);
TxtEntry.Text = Mul.ToString();
break;
case "/":
Div = div.Dividir(primero, segundo);
TxtEntry.Text = Div.ToString();
break;
default:
break;
}
}