[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