[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