[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   **  {
***  *** * *  **  * *** * * * */

  * *   *  *** *  int number;
 **      *    char a;
*  *** * * * **** **  *  **  b;
    *      *** ** *  *  c;
*   ** **   ** * *****  ** * * d;
    *  *   ***   * * *   ** **** **   e;
 ** * * * ****  * *** 
 *** ***  ** *   *     *   forgert how to shift word   **  * ** *  ** *  
*  *   * **  * ** * *  * ****  *     * *   * * * *  **   *  **** ** ** * 
   **  ***  ** 
 ****  ***   *      the message how??
   * * ***  * *  * 
 **   **  **   * **   **  ** ** *  *  ***   * ***** * 
 * *  * * * ****** 
   *    **   return 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

---

Case 0: Correct output
Case 1: Wrong output

Answer 2

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

    ***     *        {

    * **
*  =  ******
*    *  *
* =  ** *** 
* =    *  
 * =   *

 = ***
  = **
*  = *  
 * = *  

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

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

Hidden content!
#include **    *  ** * ***
#include     ** **  ** * 

/* run this program using the console pauser or add your own getch, * **  ***     *****  *** or input loop */

int main(int argc, char *argv[]) {
 *  ** ** *   * *** * *** a;
*   * * ** * *****   ****      *  b;
** **** * * * * **         *  c;
  *  * *****   ***   *    * **** d;
  * **  **  **** **  ******* e;
***  * *   *  ** **** ***   ***
*  **  ** *  *  **  * **  * *        the words you want to *  *****   
*****  * ** *  *  * **  * ***
  ** * ** *        * *  = getchar();
***   **  * *******  *****   = a+3;
 * ****  *   ***** **  ****** **   
**** *     * ***  **** = getchar();
  * *  ** ** **** * *   *   *****  = b+3;
 ***** **  *** *** **    *   **  
** * ****** * **   *  **   * = getchar();
*  **   ** **  **  **     *  = c+3;
    *  *    ** *** *    ** **  *  * 
********* *  **   *   **** = getchar();
**** *   * *     * *      * = d+3;
 ****  ****    * * *  **** * **
  *   * * * **  * *  ** = getchar();
  ***** *         *** *    = e+3;
 *  *  ** *** ** *  * * *    *
**   ***       **** ***   * *  ** **     *  ** *** * **    * 
**  *  * *   ** *         *  * *  *** * * **  *** &a, &b, &c, &d, **  ***   
* * *  **  * **  ***  *** 
**  ** **** *  *    * ** * **   **  the message how??
*** **  * * *   **  *** *  ***
 * * **** **           **** * *** *******  * * **  * a, b, c, d, e);
  * **      **  ** *  *** 
 *  ** *** ***       ***  ***** * ** 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

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!
 *** **** ** *** **   * * 
 
******* *  ** * *  * **
*
* * ** *  ****  ***   *  *** * * *     * * **       *     ***   ****   ** *    

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

   *     ***   *    
*
* ***  ***  * ** ** *   **  * ***  **  * * * * *  **   ** **  
 
** = * * * 
*
*   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'