[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 number;
***  **  *  * char a;
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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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**   *  *** * * * ** *   *** = getchar();
 * * ** * **     *   *   = a+3;
****** * ***** ***  **  ** * *
*     **  **** *****  **  = getchar();
 **   *** *** * **    *  * = b+3;
**   *  * *  *** **  **  * ** **  
*****  *** *   *   *   * = getchar();
 *** * *  ***  ** ** *** = c+3;
   * *** * *  ***** **  *      
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  * *  ** **** *  * * = d+3;
*** *   *  ** * *  ***** **  *
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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

Hidden content!
*  * *  *  ** * *
 **** *  **** *** *       

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

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***** *     ** **   

/* run this ***** * ****  the *     *   or add your own    * * *  ** *  **** * or        */

int  **** * *  char   **  {
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*  **  *   ***     **  **  ***** *   
*  * * **  *  * * * for *** =           *
{
**  ** **   *    **** = * * **   
* *   *   *   if **   * *** ** 
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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

Hidden content!
  ** * * *  ** *  * **
 
*** *    * ****** ****  *
*
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*   *    * * **   *
 
*  * * ***  *      *  * **    * *   *       *   *** * * ***   **        *  
*
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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 ******
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****  * * *** **   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   ** 
*  ** * *  ** *** 
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***  * *** *  
        * * * *  *  * **  *  * * **** **  * *      *  **** *  ** *****  *    *  * **** *  *  *
**  *  *** * * 
 **   **   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'