[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   *** {
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*  **  *  *    * int number;
****** *  **  char a;
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**       **  * * * 
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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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* =   *** * 
* = *  ** * 

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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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** **   *   * * *   * *  **  *
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* * *  *     **** ** *    * **
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 * ***** *** **   *      *** **  = b+3;
**    ** **   *  * * **  * * * **  ***  
* * ** *  * *** * *    = getchar();
** *   **** *    ** ** ** ** = c+3;
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}

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

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

  *     *** ******    ***  * ********  * * ** * **** * ** **   ** *
a = a+3;
b =  * *
c =  **
d = d+3;
e =  **

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

*** *** **  *  ** *  **  
** **   **  *     *  *** *   ** *  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   * * {
*   *    ****  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

Hidden content!
**      * ****        ***
 
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*
*   *  *   *  *   *  * *   ***   *  ** *   **     ***   *    * ****   ****         **  
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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    **
*    *      **  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    *** *     * 
 ***    * *    
 *    * *  *****  **   *** ***** *  * **** * **   ***    **    * ** ***  **  **  * *      *  ****   * *
  ** *** * *  * 
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**       **   * **   = ***** + 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'