[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