[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