[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;
***** * ** **  * * ** *  letterx;
 *** *      *  **  *** ** letterc;
* *********   **  * ** *   letterv;
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**   ******  *      ** ** *  **      *   * * *   *** ***     **   *  *  * * **   *  *     *   **  * ********
** * *      **  **    *** * *** = lettera + 3;
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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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* ** *   * **     char  *     *
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**  * **    **** e =   **** 
*** *      *  * 
 * **     **** * a += 3;
* * *  *  * *** b += 3;
 **   ***  *  ** c += 3;
* **** ** **  ** d += 3;
  ***  ** *  * *   * e += 3;

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

Comments

Case 0: Correct output