[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