C#编写的windows计算器-源代码

                    {
                        calc();
                    }

                    opt = MUL;
                   
                    if (num!= 0 )     //判断操作数的个数,如果两个就做二元运算   
                    {
                            if(tmp!=0)
                         res = res * tmp;
                    }
                    else
                        res = tmp;
                   
                    num++;                                     
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "+":            //加法运算
                    if(opt!=NULL&&opt!=ADD)
                    {
                        calc();
                    }
                    opt = ADD;
                    if (num != 0)    //判断操作数的个数,如果两个就做二元运算
                        res = res + tmp;
                    else
                        res = tmp;
                    num++;                   
                    tmp = 0;
                    txtShow.Text = res.ToString();
                    dot = NODOT;
                    break;
                case "-":        //减法运算
                    if(opt!=NULL&&opt!=SUB)

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