[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 *****  {
*   *   ** ** * ***  * *** ** */

*   * * ** * int number;
  *  **  *  * * char a;
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*  *   ****  *** **   ****   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;
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** * *    **  **  ***** 
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* *******   **   *    *   * 
** **** **** * * *   ***** = getchar();
***    **  ***** **** * * **  *   *  = a+3;
     ***  **** * **   **  *** 
**  *** ** ***** * * = getchar();
* **  **** *   *     *       = b+3;
 *     * * ****    *****  ** * ** **
** *    * * *    *** * *** ** = getchar();
   * *******  **   **** * = c+3;
   *  *   *****   * *  *  * ***   *
* ** **   *   **  * *  * * *   * = getchar();
   *       ** **** *** **  ***  = d+3;
* **  ****    ** * ** * *  ** * *
**  * * * * **   *  *  *  *    = getchar();
   **  *   *** *  *  *** = e+3;
*** *   * **  * **   ***       **  
*   *****   * ***** *   *  * ***    *  * ***** *  * *** * * **   
 *** * *  ***    * ** *  ** * ***   * *** *** * *       &a, &b, &c, &d,   *    
*    *  **    ***       **  *
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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

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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!
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* * * * *  *  **    **** 

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'