[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