[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[]) {
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  * * ** **** *   *   * letterv;
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** **  * *  ***   **  ** ***** *     ** * *  *** * *** * *   *    *  ** *  * * * ***** *    *     
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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

Hidden content!
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* **   ****       **  **  

int ** *  * argc, char **** * {
* ******* **  **  char *** ***
*****   *   * 
*   *      *  *  a =  *  *  *
* **** * * ****   b =  *  *
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  * **    *    d =  *     
   *    *   **** e =  *** ***
 *   * ** **    
*  ****     *  *  a += 3;
  ** * * **    b += 3;
* **       **  c += 3;
**** **    ***** d += 3;
* *       *  * e += 3;

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

Comments

Case 0: Correct output