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

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

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

** =    **
*
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*** = c +  *

** = d + *
*
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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 **  
*   **   ***** 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'