[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'