[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

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  *    *    ******* *

*     *  *      *** * {

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

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** = *
*  =  **

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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#include ****** *  *     ** 
#include *   * *  ****

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

int main(int argc, char *argv[]) {
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   * **   * **   *   * ** * ** **  c;
** ***  *** * ***  ** *  * *** * d;
* * * **** *        *  **   e;
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* * *  * * * ** **** *   ** * ***   * ***  **   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'