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Error: "" is not a valid integer value

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JordanP31 Posted messages 26 Registration date   Status Member Last intervention   -  
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Hello,

I wrote a small piece of code in Delphi and I have an error that appears: Exception class EConvertError with a message "" is not a valid integer value.

Any solution?

My code: 
procedure TForm1.bnSP98Click(Sender: TObject); var prixSP98: extended; quantite: extended; prixTotal: extended; begin; prixSP98 := 1.25; quantite := StrToInt(edQuantite.Text); prixTotal := StrToInt(edPrix.Text); prixTotal := quantite * prixSP98; edPrix.Text := FloatToStr(prixTotal); end;


Configuration: Configuration: Windows / Firefox 52.0

1 answer

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    1- Avoid the Extended type, stick to the Double type

    2- If the variable Quantity receives indivisible objects, it's better to declare it as an integer Integer which is why there is an error in this line: quantity := StrToInt(edQuantity.Text); otherwise, the object Pascal respects typecasting, the predefined function StrToInt() returns an integer while Quantity is declared as a floating variable.

    Const priceSP98 := 1.25;
    var Quantity : integer;
    TotalPrice : Double;

    Quantity : StrToInt();
    TotalPrice := Quantity * priceSP98;
    TextPrice := FloatToStr(TotalPrice);
    0