[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

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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

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*** * ** ** * * ***  *

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