[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