[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