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Asked: 2022-06-14 05:05:43 +0800 CST 2022-06-14 05:05:43 +0800 CST

Problem with the addition of two decimal numbers V10.4

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The problem is the following, I am currently developing a console application which adds two decimal numbers (Numbers of type double), these numbers are received by keyboard. But when doing the calculation, it shows me as a result a number in exp (I think that's what it calls ) and I don't want it to appear that way. I want it to be this way, for example, if we add 2.5 + 3 = 5.5, that is, I show the results as the Windows 10 calculator. The version of Delphi that I am using is 10.4.

Image of the program running (Example):

enter image description here

Here, it should be: 2.5 + 4 = 6.5 only and if the sum is of larger numbers, it gets more confusing.

I would also like you to explain to me why this happens in Delphi, because I have previously made this program in C# and the result is correct, without a lot of complications.

This is the source code:

program Project_Suma;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils, System.Math;

// Hacer un programa que lea dos números introducidos
// por el teclado y calcule e imprima la suma de los mismos.

begin
    var
    Num_1, Num_2: double;
    Write('Introdusca un numero: ');
    ReadLn(Num_1);

    Write('Introdusca un numero: ');
    ReadLn(Num_2);

    WriteLn('Resultado: ', Num_1 + Num_2);
    ReadLn;

end.
delphi

1 Answers

  1. Best Answer

    When dealing with floating point numbers, the standard output respects a scientific notation, what you should do in these cases is "format" the number, that is, represent the data in a more appropriate way to present it to the user, for example, by means ofFormat()

    WriteLn('Resultado: ', Format('%.2f', [ Num_1 + Num_2 ]));
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