[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!
***   * * *    * *****

int  **   ** argc, char * *    {
 *   ** *       * * *  * *  */

*** *** * **    int number;
* ***    * * * char a;
***  *  **** *   ***    ***  b;
* ***    **  *** *** *  *** ****  c;
   * **   ******* *   ***  *   d;
**** * *  ****  ***   ***     * e;
* *          ** * * **  * 
* ** ** **  ***     * * *****  forgert how to shift word **    *  *****  ***  * 
*     *    * * ** *   * ** ***    * * *      * ****  *   ****     *****
* ** * **** 
*** * *  * **  * ***   the message how??
* * **  *  * 
 **  *  *  *      ** **** *******               *****  
****   ** *   * ** 
  **  **  **  return 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

---

Case 0: Correct output
Case 1: Wrong output

Answer 2

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

*       *
  = ***  
 *  ** ** 
  =  *  *
** =    *   ** 
* =   * **  

  = **
  =  * 
   =  
*  =  

  * * *  
  * **** 
*      * *
  * * 
  * * *** 

*  * *  **  *  *   * *
*

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

Hidden content!
#include ***      * *
#include  **  ** * ** *

/* run this program using the console pauser or add your own getch,  ** *    * **** *   * *** or input loop */

int main(int argc, char *argv[]) {
*   *  *** *****  **   *    * a;
*   * **    **** ** * **  *  * b;
  *** *  **** ****  *   **     c;
***** **   * **  *    **  ** ** *** d;
**   *  **** **   ********  ** * e;
* ** *   *  *  ** * **    
** *   **  ****     * *       ** *    *  the words you want to **     *    *
**  ****   * ** *  *      * *
*** * **  * **** * ***  ***  *  = getchar();
  **  ***   *  ***  *    *   = a+3;
 ****   *  ** *          * * *   *
 ***  **   ** ***  *** *   = getchar();
 *  * ***** ******* *** = b+3;
 **      *  *    *     ** *****
***** ******* * *  * ***  *  *** = getchar();
 *** * ** ***   ** ***** * = c+3;
******* ***** * * ** **** ***   * ***
 ***      * * ** * *** * = getchar();
  * *** * ** * *   * *  **   *** = d+3;
***      **    **** ** **   **    *  *
 *  * ** *   *** * ***** = getchar();
 ********   *    **  ** *  = e+3;
 *  *     **  *  *  * * ** *** * * 
 ****   **  * ****  *  * * *   *** **  * * * * ** * **  *     * * 
*  *** *  ***     * *   ***   *  ***** ** *   ** *  &a, &b, &c, &d, ** *  *   
       ** ***  *  * *** *    **   
  *** * *   ***   * *   *  * the message how??
*  *    **      *   *  **
 ****     *******   *    * *  **    *    **    ** **  * a, b, c, d, e);
* *******  **     ******
    *  *  ***** ** *  ****    * 0;
}

Comments

Your program receives only 2 characters, and it doesn't move characters' positions.

Try to make it receive 5 characters, and move their positions forward by 3.

---

This exercise expects only 'hello'. However, your code has.....

printf("Put the words you want to decode:");

Kindly consider delete this part :)

Answer 4

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

int *    * * char **  {
/*
      * * */

* **   *    

* ****      ******  ******    * **  ******* ***   * *   
a = a+3;
b = ***
c =  * 
d = d+3;
e =   *

**** * * the * *  **
* **** *** ** * *  
 ***   ** *     **         **   *  

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

Comments

prog.c:28:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:32:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:32:1: error: unknown type name 'OUTPUT'

---

Your program can end at
  
    return 0;
}
------------------------------------------
You don't need to put

INPUT

ebiil

OUTPUT

hello

---

Case 0: Correct output
Case 1: Wrong output

Answer 5

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

/* run this    *   ** the ** *   * * or add your own      *  ** * ***   *  *  * or     *   */

int * *  *   char     ** {
  * *        int num,  **
   *   *** ** *  * * *
***  **  ** * 
**** ***  ***        * ** ***  *  *  *
 ** *    * *** for  * =        *  *** 
{
 * *       ** *    = ****   
* ***      *  if *  *   * *** **
**** *   ***  *  = **   ** *  * 
**** * * ***   *  * * * ****
}
* ****     **  *  *    ***    ** * *  *   **** 
***   * ** ** * **   0;

Comments

prog.c: In function 'main':
prog.c:19:2: error: expected declaration or statement at end of input
  return 0;
  ^~~~~~

---

Great job using an array and a loop. There are two mistakes found in your code. Please check
1.     printf("\n\n%s", code);  <--- in order to make it match the fixed output '\n\n' should be deleted
2.     At the end of your code, there's something missing.

Answer 6

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

 **  *** * *** ***  *   

* *  * **   *     **  **  * *       * *  ***     * * ** ** ***  *   ***   *   
*
* *     *** *** * ***   *** * *
 
  *   *    ** *

 **** *  **   *    
*
* ** ** *         *   *    * ** *     ***  **   * *** ** **  * *

** = *   **

*    b +  

* * = c + 

* = d +   
*
*      * 

* ** * *  * **   *   **** **   *      ** *  

* **    
*
* 

Comments

It's correct lol you can't judge me

---

Well, that's because your output doesn't match with the fixed answer. Please take a look at this
printf("%c%c%c%c%c\n", a1, b1, c1, d1, e1);

Hint: You should delete something  :)

By the way, great job.

---

printf("%c%c%c%c%c", a1, b1, c1, d1, e1);

How's that?

---

That's correct.

Answer 7

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

int **** argc, char  *  * {
     *   * * ** **  char    ***
     * * *  *  *   char * ** 
 ** **    *  *   char *  
  * ** *   *    char  * *
**   *  **  * * *     char    *
**    * *    * ** 
 * *   *  * ** *** *** *****   input the letter to  ******** *  
* *   *  ** 
**  *  * * *   * *****  * *  ***   **   **  *****     *   * **  **    * *     ****   *****  **        ***  * 
* * * ** ** ***    *  *  =   *  + 3;
*    * *     *   **  = *   + 3;
   *  ***    **     *   = *  ** + 3;
**  **     *  letterc = * * + 3;
*    ** **  **   *    =  *  + 3;
***   *     *** 
 *** *  *    *** *** *      **** **     **  ** * *   *    **   *    **
 **** **   *  
** * **    *  *  return 0;
}

Comments

-----------Re-judge-----------
Case 0: 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 8

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

int ** ***  argc, char *argv[]) {
 * ***  * * * * * char   *  * *
* **  ** ** * char letteri;
*** *  * *       char      
** ***  ** **  *** * char  **** 
 *   ***  *   * * char *  * * 
*  ** * *    *  
 *   *      **   *** *    * input the letter to encode: *  **** ** * *
  ***  * ** * 
 * **   * * *      *   *    * **  *    **    **    **   *      *** * * * * *** * **     * *****  *  
* **** *** *   *   * **   +3;
* *    *       *  *       ** +3;
 ** *    * *  **  * *   +3;
 * ***  * *  *   *****  +3;
  **       *****  ** * ***   * +3;
   * * * *  * 
 * * * *  ***  
***   **   ***  ** * *  *  *  ***  * *  **  ** * **      * *** **
*****  * * **     
     * * * *  return 0;
}


INPUT
*  *     *     *  **
 * * *  **
OUTPUT
 *    *  *******

Comments

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

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.

---

prog.c:27:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:30:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:30:1: error: unknown type name 'OUTPUT'

Answer 9

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

int  *  ** argc, char  **   {
*  ** * ***   * char *** 
  *    ** **** * char  ****
 * *   **** * char  *  
****   **    char   ** 
*    ** * ** char ** ** 
** *       ** ** 
* **    *** ** * *  * ***  * input the *  *  to **     * **      **
 **   *  *  
 * *  ** **  * **    ** *  ** * **** * ** * ****  *  *  *  *   **  *    ** ** * * *   *  *** *   *
 *     **  ** ** 
** * *         letter = letter + 3;
     *  *** * * ** = * *   + 3;
  ****** *  ** =  * * * + 3;
  * * *   *      *** = *    + 3;
 * *** ****  **  ** =  **  + 3;
*****     *   * 
*   ** ****  * *   ***   **** letter is *  *** *     * * *  *** *    *  * ****  **     *  
 ****  * * * **** 
* ***  * *** ** return 0;
}

INPUT
*** ** * * ** ** * *
        **  ******
**** 
    * *** * ** * * 

Comments

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
     The encrypted letter is hello

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.

---

prog.c:26:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:29:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:29:1: error: unknown type name 'OUTPUT'

Answer 10

Hidden content!
#include * *** **  ** *

int main(int argc, char *argv[]) {
* ** ** **  **   **  ***   * * * lettera;
**  **  * *******  ** * *    * *  letterb;
* *** * *   ** **     *  *   *  letterc;
** **** * * ***  * * * * letterd;
* ******* *       * ** ***      lettere;
 **  *   **  * ***     
**  * *    * **               ***  ** ***  %c %c %c ****  * *    *  * ***  *   ** ** **  **  ** *****     ** ** **   * *  * *    
 **     * **   * *  *   **  * *   = lettera + 3;
* * * *   * **   ***  ***  ****  * = letterb + 3;
* *    *  *  ***** **   ***  **  **   = letterc + 3;
*     * ** **   ** **   *  = letterd + 3;
 * * *  ** *     * *  * *****    * = lettere + 3;
** *  * * * *  **   *****  *     * * **  *    **    **** 
* *****   *     * ** * * *      * * *  ** %c %c %c  * **   **  * * * letterb, * **    ****  ** 
    *** ** *****  **  * *
     **   *  *   *  **    **    * 0;
}

 **
**   *
**** **  *  *  **
 ***
//hello

Comments

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: e b i i l
     h e l l o

Also, it's an online compiler, if you want to make a comment don't forget to use //. For example, //input ebiil
//output hello

Anyway, great job. Full marks.

---

prog.c:25:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:28:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:28:1: error: unknown type name 'OUTPUT'

---

prog.c: In function 'main':
prog.c:10:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%c %c %c %c %c", &lettera, &letterb, &letterc, &letterd, &lettere);
     ^~~~~
prog.c:10:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:17:5: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
     printf("%c %c %c %c %c", lettera, letterb, letterc, letterd, lettere);
     ^~~~~~
prog.c:17:5: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:17:5: note: include '<stdio.h>' or provide a declaration of 'printf'