[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!
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#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