[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 * * * * ** **  *   * * 
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*  * ***  * * 
*  ** **    ** *  * the message how??
*   **   *     
 * * *  *      * *   ** *  **  **  ** *   *** * ***     
** * * * ** * *  
 **  * *  *    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[]) {
***  * **** ** **** **   *   ** a;
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     *** ****** *    * ** *  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??
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     * *** **** **  *    **  ** ** * * ***  * 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!
*     * *     *** *  

* **  *   * *  *****   *  
 
*      ** *** *   * *   ****    ***    *    *  **       **  **       **** *** *      *   
*
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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'