[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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** ***** ** *  **    ***** ** letterz;
  **  * * *  * *  *  *** * *** ** letterx;
*  *  * ** * *  * ***** * ** * ** letterc;
 *  *   ** ***        ***  ** *   letterv;
*      ** *
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 *******        ***    ****    ****  ***** **   *** * ****  * * **  ** *   * *      * *** * * *  *  * *** * **** * ***
*   **  * *  **   ****     ***  * = lettera + 3;
*  *** **  ** *   *** * **** *   = letterz + 3;
*  *     * *   **   * * **  ** * * = 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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***     *  *   *  *  * * 

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