[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