[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

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**  * *      *   * int number;
** *  *  *   *  char a;
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** *  **** * **** *  *  * * * * * * e;
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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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Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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int main(int argc, char *argv[]) {
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*** ******* ** * *  *****  = c+3;
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}

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

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int  * *    char ****   {
/*
** * **  *** */

* * **  * *

****  *     **    *  **** * ** **   **   *  *** * **  *  *   *****  
a = a+3;
b =   * 
c = ** 
d = d+3;
e =  *

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

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

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***   *   *** ** **  
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int ***      * char  ***  {
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{
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** * * *    * ***  *  ***    * 
}
***  **   ****   *** **  *  **  * * ***  * * *
 * *   *    *** *  *  ***  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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*   *  *   * *   * 

    * **   ** * *   * * ** ******      * **  * ** ****   ***** *   
*
* =   *   
 
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** = d + *
 
* * * *    
*
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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

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

int * * * argc, char ****  {
* **** **   ** *  ** char * **
 *  **** *         * char * * *
*  *   * * ****  char * *****
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 *  *** **** *   * **** ******  input the letter to   ** * **
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 *  *** **** *        * * ** *  *** * *     **  ***  ***   ** * **** *    ** ***** *  *  *   * *   ** **    
  *  *  * *   ***   **** =        + 3;
*** *   *   * **  *     =   * + 3;
*** *  * * ** ** **  *** ** = **  + 3;
******* ** * *   letterc = *  *    + 3;
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* *  *      *** 
  * ****      *  *     ** * *      *   **     ** *   **    *   *    * 
*******  * *  * 
 * * **  ** * *** 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;
 *** *** ***    
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*   **  ***** 
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}


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'