code afficheur 7 segments

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bonjour je suis un tuto pour apprendre à programmer avec arduino, sur les afficheurs 7 segments : voici le code qui est présenté .

 if(chiffre >= 8)
    {
        digitalwrite(bit_d, high);
        chiffre = chiffre - 8;
    }
    if(chiffre >= 4)
    {
        digitalwrite(bit_c, high);
        chiffre = chiffre - 4;
    }
    if(chiffre >= 2)
    {
        digitalwrite(bit_b, high);
        chiffre = chiffre - 2;
    }
    if(chiffre >= 1)
    {
        digitalwrite(bit_a, high);
        chiffre = chiffre - 1;

on incrémente une variable "chiffre" et si cette variable vaut 3 par exemple, le bit b et sont high, mais quel est l'utilité de la fonction " chiffre = chiffre - 1 ?
       

bonjour,
on décrémente de 1 simplement


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