[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!
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int     *  argc, char  * **  {
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**          ***  int number;
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* **** **  ** * * *   *** c;
* ** ** ***** * *  * * *  * * d;
***   *****  *  *     *  *  e;
**   *    *  *    *  * *  
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** **  * **  
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** * **  *  *  
*  *   ***** ** * *    ****   **** *** *    *     *  *  * **  *** 
 ** ** *  * * * 
* * *     * * *  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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*  = *  * *
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* = ***
** =  *
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* ** *** 
  *  ***
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* ****** 
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*  **  *      **  **   * 
 *

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[]) {
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 ***   ** ** * * ** *  * *    b;
  ***  *  * * *  *** * *** *   ** c;
**  ***  **  ****     *******  d;
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*****  * * *  ***  * ** *  
**  ***      *****  *  *  * * *****  ** the words you want to   ***** *** 
 *  **  * *** ***     * * * *
* *  ** ***   * ******  **  *   = getchar();
*** *   **** **   **   **  ***** = a+3;
 ***** **   ***   ***** * * *** *
* ** **  * ****  **  * **** = getchar();
*  ****  *  * *  * * ******   ** = b+3;
* **** ***    ** * ***   ***  *
* *    * **     *   *    *** * = getchar();
  *   **  *** **  ** * **   = c+3;
  * ** ***  ****    *  **  **  *   ***
***    **  **   ** *******   = getchar();
** *  * * ** * * * **    **   = d+3;
**** **** **** * * **   ****  * *** **   
*    *  ** * * *  **  *    = getchar();
**** *********    * *  * *   * = e+3;
*** **  ** * * ****  **  *   ***** 
* *  *** ****  ******   * * *   *   ****  *  *** ** ******  
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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!
***  *  ****   *   * * **
 
 *** ** **  *     

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

**  *     * 

*** *   ** *   *  

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