[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!
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#include      *  ** * *
int main(int argc, char *argv[]) {
** *     * **  *  **     *****   lettera;
 **   * ***** **     *  letterz;
***   *    **  **  *        letterx;
*  * * * ***     ****  * *** *** letterc;
*    * * ** * *  * ** *   *   *  letterv;
*** * * **
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* * **    **** ** ****  ** ** = letterx + 3;
*  *****  *** ** ***  *  * = letterc + 3;
 ** * ** ***   **  ** *  *** * *  = letterv + 3;
*  ** *** *   **  * * *
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 *   *  *       ***  *  **  ** 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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 * * *  * *    * char * * * *
*** *   *  **    
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    * *      ** b =  * * 
*  ***** ***  c = ****    
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* ** **  * e =  * 
       *      
       ** *  a += 3;
** *** ** *** b += 3;
***     ** **** * c += 3;
 *   *  *  ***  d += 3;
*******   **    e += 3;

 *   *     * * **  **
     * ****** *     * *** *
 *        *  * *   *
 ** *          **  *  * ***  
  *****     * **** ****
**  **  *  ** 
**   * *  * 
 * **   *    * *    
**** *     * **  * **    0;
}

Comments

Case 0: Correct output