[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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* *** *  * ***    char a;
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  * **    **  *  *  *  *  c;
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        * **   * ** 
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*   **      ***     ** **   **  *  *    *  *     ****  ** *  *   **    * * * ** * * 
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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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*   * *** ***  *  *  **

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

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  ** = * *  ***    ***  
{
*** **  *  *  *   = *** ** ** 
* **     ****** 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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 ** * **   * *  ***   *   
*
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  * ** ***    **    *   *  ***    * *     *  ***  *    *  *** **** **   **   *    * *  *  *
 
 *  *  **       * * * * *

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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

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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'