[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