[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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#include   ****  *****
int main(int argc, char *argv[]) {
 ******* * *  ** *   * ** **    lettera;
    ***  *   ** ** **   * letterz;
*  *  * * *** *      * * * ** letterx;
*  **   * * ***  * *   **   ** *  letterc;
 ***** * *** * *** * **     * 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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**** ** ** * char **  **
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** *    *    *  b = ** **
     **     c =  * * **
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* * ***   **  ** e =  *    
*******    *** 
 *    *      a += 3;
  * *  *  *   b += 3;
* *   **** c += 3;
*** ***    **     d += 3;
     *   ** * * e += 3;

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

Comments

Case 0: Correct output