[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