[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 **    argc, char * * {
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** * *   * ** * int number;
** ** *     **  char a;
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* *** *  * * *  ** * **** *  * c;
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* **  *    * *  * *
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   ** ** **  * **  
   **   *    *   * *  ** **    * **   * * *    * **
 * * **     *  *  
****  * ****    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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*

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;
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**  **      * * ***  *     **  
*  **  *  ** **     * ***** *  = getchar();
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*  *  ****** ***   **      = getchar();
   * **  ******   *** * *   *   = b+3;
****  * * ***          *****    **  **
*** *  *    *  * * *   * *      = getchar();
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*   **  * * **  *** * *****  *
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* *   * * * ** *      **  
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}

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

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

* **   **     * * ** *
  *    * **  ****** *   *  *   * 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,   **
*  *    **  *      * 
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* *    ** **    ***        ** ***** *** *
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{
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*  **   * * **  *  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!
    *   *  * ***  
 
 * **   ******  **   ***

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

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

   =   *

***   b +  *

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*  = 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   ** * 
* *** *    *****  
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 ** *  *  **   
* *** *   **  *  * **   *  ** **   *** **   ***  ** * *** *** *  *   *   **** *   **  **    
  * *     * ** ***** =      + 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'