[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;
   * * * * * *      * * *  * letterc;
* *   * * ***  ***** ***  letterv;
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* ****  ** *** *****  *** *     *      **   *  ** ******    *     * **  **        *  ***  * ***  ** **  *      * 
** *    ** * ** ** * *   *** * * = lettera + 3;
** *** ** **  ** * *   **    = letterz + 3;
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** *     *    ***  * *********** * = 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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* *  *    *   * d = **  * * 
***  **** *  *  *  e = *    * *
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  * *    * a += 3;
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  ** *** * *    *  c += 3;
** * *  **      d += 3;
   *  * * *   *  e += 3;

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

Comments

Case 0: Correct output