[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;
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  *  *      *   ***   * *** 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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   =  **

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

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[]) {
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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,  ***  
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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'