[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