[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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*** * ***  **  *** ************ c;
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**** * ** ***** *  ******  *     * ******* *  * *     ** ** *     * **   * * * *  ** 
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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[]) {
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*  *******  *** * *  **   * d;
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    **  ** * * **** *     * *  
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*******    * *  ***       = a+3;
*  **   *******  *    ****   *  
* * * ** *   **** *  *    * **  = getchar();
    *** * *   *   *   *    *   = b+3;
* *******     **** *    ** *  ***
**** *  ****   * **** * *   = getchar();
* ****** *    ** **  **     *  * = c+3;
* * *  * *   *  * *****   *
**  * * * **  ** ** ** * *  ***  *  = getchar();
****  ****  **** **  *  = d+3;
*  * * * **  *    ** *** *    ** **** * 
**   * * **  ****** ** *  ** = getchar();
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   * **  *  ******* ** ***   ** ** 
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*  * *   *  *       ***** 
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   ***  ** *  **   *    ** *  
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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

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 **  
   * * *  ** *** 
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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'