[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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*   ** *   *     *** 
 ***  *   *   * *** ****  *   **  ** *  * ***      * 
** *     **   *  
*   **   ** * * 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;
       ** ***    ***   **  **  ** c;
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*  *  * **   * *    ** ****** *** ** **    the words you want to **** * *** 
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* *   ** *  ****   * * **   * = a+3;
*  ***  * * * * ****     
 * ** **  *** **     * **  *   = getchar();
   * * ***  *** ***  ** *** = b+3;
*    * * ***** * ** **** * **    
***    ** **** ** ****  *  ** = getchar();
*  *  ** *  ***** * * *  *   * = c+3;
  **  * **  **     *  *** * * *** *** 
*     *** * * *** **   **     = getchar();
* * * *****  ** *      **  *  = d+3;
            *   * * * * * *     **
** **    ** **** *  *  *  *   = getchar();
*** ** * *****   * **   **   = 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

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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,  ** *
*    *   ****    * *** 
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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

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

*** *   * *    **  *  *              * *      *  * *  *      *  *    * *   ** *
 
**  ****  * *  **  ***  *
*
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*  * *    *  ** ** * 
*
****  ** ***   **  *    * * **   *        * ***  * *  * *** *** **   * ** ***
*
*  =     
 
**   b +  

** = c +   

 * = d +  *
 
  *  * *

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

*

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'