2
I created a calculator using Windows Forms, it ran perfectly, however when clicking the operation button before the number button (to insert a value in the display) an error happens that closes my program alone.
I wanted to know how I can do so that initially the operation Buttons are disabled, and after clicking the number button is available to carry out the operation. I appreciate the help..
3
You have two solutions:
1 - Using the Try / catch , where if an error occurs your program will fall into the catch and then you show a message or something like.
2 - As @Jeterson said in Load of your Form all calculation buttons are disabled ( * , + , - , % ). Only after you click on one of the numbers to perform their operation will these buttons be activated and available to be operated.
No load of your Form:
btnSoma.Enabled = False;
btnSubt.Enabled = False;
btnMult.Enabled = False;
btnDivid.Enabled = False;
Finally, in the event Click of the numbers, when one of them is clicked you will activate the Textbox of operations:
btnSoma.Enabled = True;
btnSubt.Enabled = True;
btnMult.Enabled = True;
btnDivid.Enabled = True;
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In the constructor of your form class you put the button to start disabled.
public Calculadora(){
InicializaComponent();
btnSomar.Enabled = false;
//outros botoes que voce queira deixar desabilitados
}
Now in the event click the number button you place btnSomar.Enabled = true;
to enable the button.
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Within the code that the button number runs, you can put a
btnCalcular.Enabled = true;. Since you need to leave the value ofEnabledhisfalse.– Daniel Dutra