Putin ajutor

Buna!Am de facut ceva in c++ cu decriptari,criptari.Ma puteti ajuta?Am inceputul de problema in c++  dar nu stiu a baga codurile de la
decriptari.



#include<conio.h>
#include<stdio.h>
#include<iostream.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>
void criptare transpozitie cu doua jumatati
void criptare mansfild
void decriptare caesar
void main()
{int x;
for(;
{
clrscr();
cout<<"   \n\n   M E N I U\n\n";
cout<<" 1. Criptare ........\n";
cout<<" 2. Criptare .........\n";
cout<<" 3. Decriptare ..............\n";
cout<<" 4. Iesire\n\n\n";
cout<<"Introduceti numarul optiunii dorite:";
cin>>x;
if(x==1)
criptareCaesar();
else
if(x==2)
criptareAlfabet();
else
if(x==3)
transpMatrici();
else
if(x==4)
break;
else
cout<<"Ati tastat un nr gresit";
getch();}}

if(k>=strlen(necriptat))
m[i][j];
else
{m[i][j]=necriptat[k];
k++;   }
v1=0;
for(j=0;j<l;j++)
for(i=0;i<l;i++)
{criptat[v1]=m[i][j];
v1++; }
criptat[v1]=0;
cout<<"\n\nTextul rezultat in urma criptarii este urmatorul:\n\n"<<criptat;
cout<<"\n\nApasa o tasta pentru a reveni la meniu\n";}

http://ro.wikipedia....ki/Cifrul_Cezar

http://en.wikipedia....Alphabet_Cipher

http://ro.wikipedia....rice_transpusă