[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