[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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int main(int argc, char *argv[]) {
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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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* ***  * **  *  a = ** ** *
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** ***     ** c = **** *  
   * *       *** 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