C#编写的windows计算器-源代码

                    {
                        calc();
                    }
                    /*if(opt==ADD)
                    {
                        res=res+tmp;
                        tmp=0;
                    }*/
                    opt = SUB;
                    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 "sqrt":     //平方根运算
                    if(opt!=NULL)
                    {
                        calc();
                    }

                    //opt=SQRT;
                    if (tmp > 0)  //要求操作数大于0
                    {
                        res = Math.Sqrt(tmp);
                        //res=tmp;
                    }
                    else if(res>0)
                        res= Math.Sqrt(res);
                        txtShow.Text =res.ToString();
                    num++;   
                    tmp=0;
                    dot = NODOT;
                    break;
                case "sqr":

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