[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