[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

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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