[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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int main(int argc, char *argv[]) {
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* * **** ****** **  ** ** * letterz;
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****** ** * ***  **  *     letterc;
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   *    * *   *   ** **       * *   = letterc + 3;
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 * **  ** * ** * ** ** 
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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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int ***  argc, char * *  {
**    *  *** ** char * ** *
*****    ***   
*  ** *   **   a =   *  ** 
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     ** *       c =   ***   
** **  * ***  * d = * *  *
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     ***  **** a += 3;
 * * * * ** *  ** b += 3;
 ** *  ** * c += 3;
*   *    * *     d += 3;
  *** *    *** * *  e += 3;

* ****   *  *   ** *
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* *** *   *   **  * ** 
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}

Comments

Case 0: Correct output