[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'