[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