public static Operation createOperate(string operate)
{
Operation oper = null;
switch (operate)
{
case "+":
oper = new OperationAdd();
break;
case "-":
oper = new OperationSub();
break;
case "*":
oper = new OperationMul();
break;
case "/":
oper = new OperationDiv();
break;
default:
break;
}
return(oper);
}
public static Operation CreateOperation(string operate)
{
Operation tempOperation = null;
switch (operate)
{
case "+":
tempOperation = new OperationAdd();
break;
case "-":
tempOperation = new OperationSub();
break;
case "*":
tempOperation = new OperationMul();
break;
//进行相应的异常处理
case "/":
tempOperation = new OperationDiv();
break;
default:
throw new Exception("输入的符号不正确");
break;
}
return(tempOperation);
}
