[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;
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 *  ** *  *  * *  * * *  * **** ** input the letter to encode: ");
   *  **  ** **      * ** *   ******* * * * **  *  *  * *   ****   * ** *   ** *        ** ** ** *     *    
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 ***      *  ** * *  ** *  ****  = letterz + 3;
  * *  * *  * ** *  **   **  *  * = letterx + 3;
 *   ****  *  *  ** ** * *    *** * = letterc + 3;
** * *   ** * *  ** * * * ****   * = letterv + 3;
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*** **  ** **   * * ** *   * **  * * ****             *     **     **  **** * *****
 *  *  *  ****  *** 
   *   **  ***** **  ***  * *   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!
* ** *   *       ** *   
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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