[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'