[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