[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