[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;
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* *   *** ***  **  *   *** * letterv;
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*  * *** * *  **   * **  ****  * ********** ***  * ***  * ***** ***    * *  *  *  *     *      *      **** ***
* * * * *  * ***** **** * * *  * = lettera + 3;
**     **  *** * * * ***  **  * = letterz + 3;
  * *   ****   ****** * *******  *** = 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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int *     argc, char ***   {
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*** *****  *    
*  ** *** a =  ** ****
* **     * * * b =   * **
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  ** **  *  *  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