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

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

Comments

Case 0: Correct output