go to PowerApps Studio and add a new screens on App, after, insert also 3 Text Inputs (for number 1, number 2 and the result) and 5 Buttons (for math operators and reset) like this structure:
Now, on the Text Inputs select format = number and OnChange use Set function to valorize the numbers N1 and N2:
Set(N1, TextInputNum1)
Set(N2, TextInputNum2)
On Text Input for result, you can only specify the default value with the value of the global variable result:
Now, on the 4 buttons OnSelect use UpdateContext to execute the operation (+, -, *, /):
UpdateContext({result: N1+N2})
UpdateContext({result: N1-N2})
UpdateContext({result: N1/N2})
UpdateContext({result: N1*N2})
Finally, you manage the reset button utilizing UpdateContext for reset the global variable and Reset function to reset the Text Input for number 1 and number 2:
UpdateContext({result: 0}); Reset(TextInputNum1); Reset(TextInputNum2); Reset(TextInputResult)
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