[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