Calculatrice 1.0, Pascal

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//fpc 3.0.0

program Calculatrice;

var firstnumber: real;
var secondnumber: real;
var option: real;
var result: real;

begin
    writeln('Bienvenue dans la calculatrice !');
    writeln('Choisis une option:');
    writeln('1. Addition');
    writeln('2. Soustraction');
    writeln('3. Multiplication');
    writeln('4. Division');
    writeln('5. Sortir');
    readln(option);
    if (option>5) then
    begin
        writeln('Choix non reconnu !');
        exit;
    end;
    if (option=5) then
    begin
        writeln('Au revoir cher utilisateur !');
        exit;
    end;
    writeln('Quel est ton premier nombre ?');
    readln(firstnumber);
    writeln('Quel est ton deuxième nombre ?');
    readln(secondnumber);
    if (option=1) then
    begin
        result:= firstnumber + secondnumber
    end;
    if (option=2) then
    begin
        result:= firstnumber - secondnumber
    end;
    if (option=3) then
    begin
        result:= firstnumber * secondnumber
    end;
    if (option=4) then
    begin
        result:= firstnumber / secondnumber
    end;
    writeln('Le résultat vaut: ',result:1:3, '!');
end.

Show compiler warnings [ - ] Show input
Compilation time: 0.23 sec, absolute running time: 0.08 sec, cpu time: 0.02 sec, memory peak: 3 Mb, absolute service time: 0,4 sec