[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;
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      ***    ****  ***    ** c;
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 *  ** **  **** * **   **         *  e;
***  ** ** *    * *
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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;
 ***   **     * * * * *   *  b;
 *   **    *  **  ***    ****  *  c;
 **  *** * ***** *      * d;
* *********       ** *   ** *   e;
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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,  *   
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**   *  *      
 * *  *   ** *    *  ***  * **  **   
*  * **    *     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 *  ***
  *** * *     
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  * ***  *  ***   
  *****   *     ** * ** *    * ***** ** **     *** **  *  ** ** *      * *  *  ** * **     * ***  **  * 
** *  * *****      * * =  **   + 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'