[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!
** * * * * * **  **** ** 
#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