[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;
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 *** * *** *** ** *** ** **      **  **** **    *      *  **      *** ****   *  ******       **** ****  *
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 *       *  ***   **  * * * **  * = 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!
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**** * *   **     char * *   *
***  *** *  * *  * 
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* * ** *  * * b = **    *
*  ***  **  * * *  c = * *  
**   * * ***** d =   ** **
** **  *     **  * e = **  ***
** *  * ****   
  *****  * *** a += 3;
  *** **  **  * b += 3;
* *  * *   ***    c += 3;
* **** **   * ***  d += 3;
 * * *  **   * e += 3;

 ** * *   ** ** **  ** ** *
    **  **  ** *  *** *  
**   **   ****  ***  * * 
*  *** **     ** ** * ***
**  *** * *   **  *
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    **** *** ** 
** * ****   * *    * *** ***  * 0;
}

Comments

Case 0: Correct output