[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