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; } }