[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