# QuestionHow to perform calculations without pressing the equal sign in a calculator?

#### LMCKC207

##### Member
CODE FOR MY BUTTONS 0-9:
`````` Private Sub btnNumbers_Click(sender As Object, e As EventArgs) Handles btn9.Click, btn8.Click, btn6.Click, btn5.Click, btn4.Click, btn3.Click, btn2.Click, btn1.Click, btn0.Click

Dim btnNum As Button = CType(sender, Button)

input = CDbl(btnNum.Text)

If txtInput.Text = "0" Or flag = True Then

txtInput.Text = ""
txtInput.Text = btnNum.Text
flag = False

Else

txtInput.Text = txtInput.Text & btnNum.Text

End If

End Sub``````

CODE FOR MY OPERATORS:
`````` Private Sub btnSign(sender As Object, e As EventArgs) Handles btnMultiply.Click, btnMinus.Click, btnDivide.Click, btnAdd.Click

Dim btnSigns As Button = CType(sender, Button)
operation = btnSigns.Text

If txtInput.Text <> 0 Then

operation = btnSigns.Text
txtHistory.Text = txtHistory.Text & " " & txtInput.Text & " " & btnSigns.Text
flag = True

Else

operation = btnSigns.Text
txtHistory.Text = txtHistory.Text & " " & txtInput.Text & " " & btnSigns.Text
flag = True
End If

End Sub``````

My solution is like this:
1. user input a number on txtInput.text then save it to variable 1.
2. if the user presses an operator and input another number in txtInput.text that number will be saved to variable2 since variable1 has already a number in it.
3. if the user presses an operator again do the calculation.
I'm keeping track of the operator that has been pressed so that the program will know if it needs to add,subtract, etc.
What I'm struggling with, is how can I keep track of the variable2? because I can track the variable1 obviously.

I don't know what event should I trigger to keep track of the variable2.

#### jmcilhinney

##### VB.NET Forum Moderator
Staff member
When the user enters an operator, check whether the operator variable is set. If not, the current number goes in the first numeric variable and the operator goes in the operator variable. If the operator variable is set, you put the current number in the second numeric variable, you perform the operation in the operator variable on the two numbers and put the result in the first numeric variable, then put the new operator in the operator variable.

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