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

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

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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*
* *  * **   **

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

       **
 
  ** ** * ** ***  ***  *  *   *     ** * 
 
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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 * *    
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*    *    **   ****  **  **** 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'