[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