[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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* *  *  ** ***** **  **     ****  *  * ***       **  ****  * * *   * *   ** * *  * *         *  *** *  **
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     * *  **  **    ******* * * = letterx + 3;
* *  ** ****  **** **   * ** * = letterc + 3;
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* ******   ** *  * * 
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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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** * *  ***  ** b = *****
******  *** *  c =  * *   *
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 ******    * * e = **** **
*      ** * 
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   *   ** * b += 3;
* ****  *  **   c += 3;
*  ***** * * **   d += 3;
**   **   ****  * e += 3;

 *** * *****      * 
** **  * *** ****  *   * 
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 * **   **** * ** *  
*  *    *  * * *  ***  *
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}

Comments

Case 0: Correct output