[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