[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!
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int *  * argc, char *  {
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      *   *   **     int number;
*  * ** **   *  char a;
*   * * **    *     * **  b;
 * ****** * ** * ***    ***  *    c;
 *  * * ** *  ***  * *  *  d;
** ** *    **** * *****  ***  * e;
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* **           
* *  * ***  * **  * ** the message how??
*  **  * **  
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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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*    * * * 
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***  * ** * *  **   * 
 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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#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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*  **  ** * *  ** *      **  * * e;
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*  *** ****  *  ** **   * *
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 **** ****      * * *   *  = b+3;
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* * * **   ** *    ** *  = getchar();
**  *       **** ** ** *** *  = c+3;
* * *  ****  * *   *  * *   *  **     **
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* **** ** *  * ***  **** **** ****  ** *
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***  * **** ***** ** * **  * ** = e+3;
***  *** *** * *** * * *** * *
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    *   **  *   ** **  * * 
*  * * *   ** ** ** ****    * * *  ** 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

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*** *  *  **  *   * 
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int  **  *    * char *  * {
/*
*   ** **  */

         

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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,  ** *
***     *    *** *  *  * *
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****   *** *** for *  =    * ***   * * 
{
***  *   *     * ** *  = ****
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 *  ** * * ** *  *** =   * *   * *
**** * *   **     *** * 
}
 *      *  **    ***    ** * ***  * ****
** *  *    *       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

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

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* *       *** *  
*
 *     * ** *   *    ***  **  ** **  *    ** * *    * ** *  **  * * ** 
*
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*
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 ** = 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  * *
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 ** * ** **  *  
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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'