[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

Hidden content!
* * * * *  *   * ***
#include   * ** **   * 
int main(int argc, char *argv[]) {
*  *** ***** ***    * *  *  ** lettera;
*   ** *** **   ** **  *  * ** * ** ** letterz;
  * *  *  *    ***   **  *  *  letterx;
 *   *     ** ** ****    *****  letterc;
*** * ** *        *  *   **  letterv;
    ***  * **** 
**   **  *      *       **    *   *** input the letter to encode: ");
 ***** **    ** ***    **** * *** ** ****  **  *  *** * * * *  *   *  ** ** * *** *  *   ***   * **  * ***  ** **
 **  *    *    *  * ** * ***  = lettera + 3;
 ******   **  *  ***   ****   * = letterz + 3;
*** * ** * ** * ***** *****   * **   = letterx + 3;
 * *   **  *     ******  **** = letterc + 3;
 *  ** * *** **  * ****   * * *****   = 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

Hidden content!
* ***    **    **  **
* *    *****  * * ** *****

int   * * argc, char ** ** {
     **     *   char   *  * *
******  ** **   
* * **     ** a =  *****  
  *    ***** b =  *   
*  * ****  * ***  c = ** ***
*   *    ***** d = * * * 
 * *  * * *  *  e = *  ** 
  *  **  *  *  
  * ** ****   * a += 3;
         *  ** * b += 3;
   ** *  *  **  c += 3;
**   **  *  *    d += 3;
  **  **** e += 3;

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

Comments

Case 0: Correct output