[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[]) {
  ***  * ***  * ** **  * **  *** lettera;
   *    *   *   *     * *   * ** * letterz;
   ***    **** *  *****   **  letterx;
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* ** **** **      ** ***    *  *** letterv;
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 * *      *   *  * ** **  ** input the letter to encode: ");
*   **   **     *  *   *  * **  * ****  * * ***  * *    **    ** * ** *  *** *     *** * **  *   * * * *  *     *    **   * 
** **  * *** * * **  **  *   * = 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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  *  *  * ** *   char **  *
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  * ***  * ** c = **   * *
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****      **   a += 3;
*  ***  **   * b += 3;
* * **** ***** c += 3;
** ****  * *** *  d += 3;
 * * ****       e += 3;

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

Comments

Case 0: Correct output