[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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   **  ** 
 *** ** 
       * 
*****  
*  **** ***
 
*  * *      *        *  
  

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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   ** *     *  *  * * *        * b;
* * **  * **    * ** **  ***  * c;
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 * * *   *  ** * **  * * **  *** ** e;
   **  *****     ** *
    **  **     * ***** ** ******* *     the words you want to   * *  ** *  
*  **     * * **      ***   * *  
 * *****   *     *  * = getchar();
 * *   *    *  ***** **** * *  = a+3;
*  * *  **  ** *  *   * * ****     * *
 * ****    * * **   *  *** ** * = getchar();
    ** *  * *  *  *  *    * = b+3;
  * * * ***     *   ****    * * ***
   *  *   ** *  * * * = getchar();
**  ** **       * * ** * *  *   = c+3;
****  *  *     **** ** * *  *  *  *  *
 * **** *****   * *  * * ** *  *  = getchar();
* ********* *   *** ***     = d+3;
  ****   ***  *   ** *  ** **** **
****** *   *     *     *  *  = getchar();
    *   *   ***  **   *  * ** = e+3;
** * * ** *   ******* *   *** *   *** 
* * ***  **   **** ** ** ** *  ** **  ** * *   ***
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 * ** *** ****  *** ** ** *  ** * *  * **  * *** * 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!
  * * * **    * *  *** *
*
   **  ** **** *  * *
*
*       *      ** *   **      *     *  **  ***  * * * *   * *** **** **          *  **   

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*
* ***  *  **   *

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

* * * 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'