[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  *    * {
* ** *   **   *  **** * *     */

*      * ***** int number;
    **   **   * char a;
*         * * *  ** *    ***  b;
*  * ***     ********  ** ***** c;
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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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*  =   *** 

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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;
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*           * **          ** *  e;
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*** **** * *   *  *   *  *  * = a+3;
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*    *    **   ***   ** *  * = getchar();
  *  *  ** *** **  *** *****    * = b+3;
 *  * ** **   **** ** * *    ***  ** *  
  *   **    *** *   *  ** * = getchar();
  *  * ******* *  ***  * **    = c+3;
***     * *   *   ***  ** **   * * *** *
 *** **** *  *   **     = getchar();
***     * **  **   *  *   = d+3;
*    *   * * **   *****  **  **** *
**   *     * *     * ** ** *  ** = getchar();
****** * * * * ******  *     **  * = e+3;
 * *   * * * **  *  *  *  *** *  ** *  * *
* * **   *   **    **  *   * **  * ** *   ** ** ** *** ** * * ** **
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*** * **   *  ** **  ** * **
* *      ***      *  *    * ***** 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

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

int *  ** * * char     *  {
/*
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* ***** *   ******  * ** *   ** * * *   ** * *         **   *   *
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 *     {
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* *   *** *    * for   * =  **    **  * **
{
*   * *        *  * =   ***   * 
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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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*
     *** * *           * * **  * **    * ***        *   ***** *  *****    *

    =   *   
*
*** * b +   

*   = c + **

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

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'