مساعدة في تحليل كود تشفير بطريقة القيصر

الفهم من خلال مقارنة المخرجات:

الاول:

#include <iostream>
#include <cstdlib> //#include<conio.h>
#include <string.h>
using namespace std;

int main()
{
    const int n = 100;
    char a[n], x[n];
    int i = 0;
    int k;
    cout << "enter the string \n";
    cin.get(a, n);
    strcpy(x, a);
    cout << "enter the space k ";
    cin >> k;
    while (k < '0' && k > '9')
    {
        cout << "error !!!\n" << "enter the space k ";
        cin >> k;
    }
    for (i = 0; a != '\0'; i++)
    {
        a = a + k;
        if (a > 255)
        {
            cout << "error !\n" << "enter new k";
            cin >> k;
            i = 0;
            strcpy(a, x);
        }
    }
    cout << a;
    cout << "\npress any kay to exit ...";
}

مدخلات ومخرجات:

enter the string 
123
enter the space k 1
234
press any kay to exit ...

RUN SUCCESSFUL (total time: 8s)

الثانى:

/* 
 * File:   main.cpp
 * Author: Mohammed Abu Zayed
 * * Created on May 28, 2012, 6:55 AM
 */

#include <cstdlib>
#include <iostream>

using namespace std;

main()
{
    const int n = 100;
    char a[n];
    int i = 0;
    char k;
    cout << "enter the string \n";
    cin.get(a, n);
    cout << "enter the space k ";
    cin >> k;
    while (k < 48 || k > 57)
    {
        cout << "error !!!\n" << "enter the space k ";
        cin >> k;
    }
    for (i = 0; a != '\0'; i++)
        a = a + k;
    cout << a;

}

مخرجات:

enter the string 
123
enter the space k 1
bcd
RUN SUCCESSFUL (total time: 10s)

تقبل مرورى والله من وراء القصد: