#include <iostream>
#include <string>
 
using namespace std;
 
int main(int argc, char **argv)
{
 
   int a, b,nbCombinaison;
   string saisieTexteChiffre;
   string dechiffre;
   // saisie
   cout << "Outil déchiffrement affine" << endl;
 
   cout << "Veuillez entrer le texte chiffré en majuscule : " ;
   getline(cin,saisieTexteChiffre);
   dechiffre = saisieTexteChiffre;
 
   cout << "Veuillez entrer le coefficient directeur a : ";
   cin >> a;
 
   cout << "Veuillez entrer l'ordonnée à l'origine b : ";
   cin >> b;
 
   cout << "Table de déchiffrement" << endl;
   for(int i = 0; i < 26*a; i++)
   {
      cout << char((i%26+'A'))<< " ";
   }
 
   cout << endl;
 
   // table déchiffrement
   for(int i = 0; i < 26*a; i++)
   {
      cout << char(((i+'A'-'A' - b)/a)+'A') << " ";
   }
 
   cout << endl << endl;
 
   // déchiffrement
   cout << "Déchiffrement" << endl;
 
   nbCombinaison = 0;
   for(int j=0;j<a;j++)
   {
      for(int i = 0 ; i < saisieTexteChiffre.length(); i++)
      {
         if(saisieTexteChiffre[i] >= 'A' && saisieTexteChiffre[i] <= 'Z')
         {
            cout <<  char(((saisieTexteChiffre[i]-'A'+nbCombinaison- b)/a)%26+'A');
         }
         else
         {
            cout << saisieTexteChiffre[i];
         }
      }
      cout << endl;
      nbCombinaison += 26;
   }
 
 
   return 0;
}

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