Program Kriptografi

Source Code C++:

#include <iostream.h>
#include <conio.h>
#include <math.h>
#include <string.h>

void Enkrip(char plain[], int a, char chiper[]);
void Deskrip(char chiper[], int a, char teks[]);
void Modif_Enkrip(char plain[], int a, int b, char chiper[]);
void Modif_Deskrip(char chiper[], int a, int b, char teks[]);

int main(){
       int pil; char teks[100];char chiper[100];int key;
       do{
           cout<<"menu pilihan \n";
           cout<<"1.Baca Text \n";
           cout<<"2.Enkript \n";
           cout<<"3.Descript \n";
           cout<<"Pilihan anda (0..3) \n";
           cin>>pil;
           switch (pil)
           {
                  case 1: {cout<<"text:";cin>>teks;break;};
                  case 2: {
                      
                       cin>>key;
                       Enkrip(teks,key, chiper);
                       cout<<"chiper hasil:"<<chiper;
                       break;
                       };
                  case 3: {
                       cout<<"chiper :"<<chiper<<",key descript:";
                       int key;cin>>key;
                       Deskrip(chiper, key, teks);
                       cout<<"text awal:"<<teks;break;
                       };
                       };
                       cout<<endl;getch();
                       }while(pil !=0);
                       }
           void Enkrip (char plain[], int key, char chiper[])
           {
                for (int i=0; i<strlen(plain); i+=1) {
                    cout<<plain[i]<<"("<<int(plain[i])<<")";
                    chiper[i]= (plain[i]+key)%128;
                    }
                    getch(); cout<<"\n chiper hasil benarnya:"<<endl;
                    for(int i=0; i<strlen(plain);i+=1){
                            cout<<chiper[i];
                            }
                            getch(); cout<<endl;
                            }
                    void Deskrip(char chiper[], int key, char teks[])
                    {
                         for(int i=0; i<strlen(chiper); i+=1){
                                 teks[i] = chiper[i]-key%128;
                                 };
                                 };
          
Hasilnya: