[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

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#include ***    * * **  
int main(int argc, char *argv[]) {
**  *     **   * * *     ****   lettera;
* ** * *  *   *  *****   *  letterz;
** * * * * *****   ***  letterx;
       ***   * * * * *  *  letterc;
* *  ***** ** *  *****        ** * letterv;
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**** *  ** * * **        ****  ** ** * input the letter to encode: ");
*** ***   ** **  ** *  **  * *  *** ** ***  * **     * *  *   *       *  *** *   ****** ** * *  **  ** * ***        
*  **** ** * *  ***** *** * * = lettera + 3;
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  ** **         ** ** ***** ***** = 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

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** *   * *  * **  * ***  
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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