[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  * **** {
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   * *  * *  int number;
   * ***    ** char a;
 ** ************     *  **    ***  b;
***  * **  * *   ***  * * * c;
*** *     ***  * *  ****  * ***  d;
**  *** ******* **** ** *    *  e;
   *   * *    *** *** 
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**  ***  *  * * * 
   * *   *   *   * 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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  = * * 
 * =   *

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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[]) {
 *    * **      **     *   a;
  **        * ****   *   *  *   ***  b;
  ***      *** * *  * *  *   *  c;
 ** *   *   *  **  ** * *  *  d;
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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 + **
*
**        
*
  ** ** * *  * **** * *   ****      ***    *   * 

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* 

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'