Created by Roxas - Icesun1989 - XundeX - Copyright reserved.

#include	<stdio.h>
#include	<iostream>
#include	<string.h>
#include	<Math.h>

using namespace std;

char alf[]={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

void codifica_cesare()
{
	char m[100];

	fflush(stdin); // Svuota lo standard d'input

	cout<<"Inserisci il testo codificare_>";

	cin.getline(m,100);

	for(int i=0; i<strlen(m);i++)
	{
		if(m[i]!= 32)
		{
			for(int j=0;j<strlen(alf);j++)
			{
				if(m[i]==alf[j])
				{
					int aux=(j+3)%26;
					m[i]=alf[aux];
					break;
				}
			}
		}
	}
	cout<<"Il mesaggio codificato e'_> "<<m<<endl;
}

void decodifica_cesare()
{
	char m[100];

	fflush(stdin); // Svuota lo standard d'input

	cout<<"Inserisci un messaggio da decodificare_> ";

	cin.getline(m,100);

	for(int i=0; i<strlen(m);i++)
	{
		if(m[i]!= 32)
		{
			for(int j=0;j<strlen(alf);j++)
			{
				if(m[i]==alf[j])
				{
					int aux;
					if((j-3)<0)
					{
						aux=26+(j-3);
					}
					else
					{
						aux=(j-3)%26;
					}

					m[i]=alf[aux];

					break;
				}
			}
		}
	}
	cout<<"Il messaggio codificato e'_> "<<m<<endl;
}


int main(){

	int opc,opc2;

	system("COLOR 0A");

	do{
		cout<<"========================================================================================"<<endl;
		cout<<"				Menu:									    "<<endl;
		cout<<"				1 - Cifrario di Cesare:						"<<endl;
		cout<<"				......Coming soon......						"<<endl;
		cout<<"				......Coming soon......						"<<endl;
		cout<<"				......Coming soon......				  	    "<<endl;
		cout<<"				......Coming soon......                     "<<endl;
		cout<<"========================================================================================"<<endl;
		cout<<"Inserire l'opzione_> ";

		cin>>opc;

		switch(opc)
		{
			case 1: system("cls");
					do{
						cout<<"======================"<<endl;
						cout<<"Menu"<<endl;
						cout<<"1 - Codifica"<<endl;
						cout<<"2 - Decodifica"<<endl;
						cout<<"3 - Esci"<<endl;
						cout<<"======================"<<endl;
						cout<<"Inserire l'opzione_> ";
						cin>>opc2;

						switch(opc2)
						{
							case 1: codifica_cesare(); break;
							case 2: decodifica_cesare(); break;
						}
					}
					while(opc2!=3);
					system("cls");
					break;
		}
	}
	while(opc!=1);
	return 0;
}