[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'