[Exercise 03] Caesar Cipher Decoder

Question

You have received an encrypted message from Julius Caesar-- the message is ebiil.  You are asked to decipher the message in order to understand what Caesar trying to say to you.

Hint

Luckily, Caesar has given you a hint, he says: 'I, myself, encoded the message by shifting every word backwards by 3.' 

Solution

Write a program that receives 5 characters 'ebiil'. Then decode those characters into 5 new characters.

Example

#include <stdio.h>

int main(int argc, char *argv[]) {


	char a;
    	char b;
	 	
	scanf("%c%c", &a, &b);
	
	//decode the message how??
	
	printf("%c%c", a,b);
	
	return 0;
}

Input

ebiil

 

 

 

 

 

 

 

 

 

 

Output

hello

** REMEMBER ** 
This is an online-compiler, don't put anything except the codes. If you want to make a comment, please use // or /* */

Answer 1

Hidden content!
       ***    * *  *****
#include ** *     **** ** *
int main(int argc, char *argv[]) {
*   **** **  ** **** * lettera;
   ** ** * ** ***** *  *   * *     * letterz;
*  ** * *   *****  ** *  **  letterx;
  *  * *    ** **  **  **** * * letterc;
    *****  * **  *     **** * *  * letterv;
******   *** 
  **           *** *** *   *  input the letter to encode: ");
 *** **  * **      * ** ** * **   *** **     ** ****  *    *  ***   ** ***** *     *  ***   ** *  **
** ** ***** *  *  * * ****  *   * = lettera + 3;
* ** *  *   *   * **  ***   **  = letterz + 3;
*    ***    ******* * *  * ** = letterx + 3;
* ** *** ***  * **     * *    ** = letterc + 3;
*  *      * *  ** *  ***** ***  = letterv + 3;
 ** ***  * ** *   * *  * *
***  *    **** * ******   * * **   * *     * ** *        ****  ** * * * *
    ** *  *  ****  * 
  ***     *  **** ** * *** * *  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Nice, it is correct. You might be wondering why your automatically-generated score is 0.
That's because it expects its output to be only 'hello'. However, what your program showed was:
     Please input the letter to encode: ebiil
     hello

Anyway, great job. Full marks.

Answer 2

Hidden content!
 * ***  ** * *   *      
** **    *  *    *  ** ** *

int ** * argc, char *  * {
  **  *  *  ** *  * char        *
  * *  * * *    
**      *  * a =  **  *
 **     *  ** *  ** b =  **    *
***** ** *   *** c =   *  *
**   ** * ** d =  **  
****      *** *** e = *** ***
 *  * ****  **  ** 
* *   * ** ** a += 3;
*  * *   * *  *** * b += 3;
  **  *  * **** c += 3;
   *    **  *  * **  d += 3;
    *  *  ** *    e += 3;

 ** **      * ***  * * 
  * *  *     ***       * 
 * * * *    ** **   *
*  *     *  *   **  * * 
** **  *  * **    * **
*   **      * * ** 
******    *     
**  ****  * ** *  
 **  * *****     * *   ** *** * 0;
}

Comments

Case 0: Correct output