Simple calculator with the teacher based on the thought of c + +, data structure, but when programming to such mistakes

 
Private void btn_ right parenthesis _Click (object sender, EventArgs e) 
{
TextBox1. Text +=") "; 

Bool flag=true; 
OPND. Push (txtDisplay. Text); 
TxtDisplay. Text=""; 
Op2=") "; 
While (flag) 
{
If (OPND. Count & gt; 
=2){

Op1=the Convert. ToString (OPTR. Pop ()); 

If (Isp (op1) & gt; The Icp (op2)) 
{
Num2=the Convert. ToDouble (OPND. Pop ()); 
Num1=the Convert. ToDouble (OPND. Pop ()); 
If (op1=="+") 
{
Tempresult=num1 + num2; 
} 
Else if (op1=="-") 
{
Tempresult=num1 - num2; 
} 
Else if (op1=="x") 
{
Tempresult num2=num1 *; 
} 
Else if (op1=="present") 
{
Tempresult=num1/num2; 
} 
OPND. Push (Convert. ToString (tempresult)); 
} 
Else if (Isp (op1)==Icp (op2)) 
{
flag=false; 
} 
} 

This is the place where running error, click on the right bracket and then according to the equal sign will appear this kind of mistake,
Have not learned c #, because only learn c + +, looking for half a day on the Internet, library, did not find the book for a solution,
But somewhere else forced into is no problem, only the results of their calculations and Push into stack force transformation after the Pop, appear this kind of problem again after

I hope you bosses in order to solve this small problem, I this small white

CodePudding user response:

Push a pop two error, of course