[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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**       * * **  
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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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#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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*    ****    ** ** *  *  
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* * * * *   *  *** *******  *  ** 
* *  *  * *   * * * **** **    = getchar();
* **  ** *  ***** **   **  = c+3;
***  **  ******        *  * *  *    *
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**  * *  * ****        ** = getchar();
*  * *** * *   ** ** ** *  = e+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 =  **

**   * the ***   
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* *       *  * ****** ***** *

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

/* run this *    **  * the *  *        or add your own   **  ** * * *  *     **  ** or  * * **   */

int ** ** ** * char ** * * {
*****    ***** int num,   *
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*  **** * * * * 
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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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*
* **    *    * *  * **    * *  * * *    ** *  **     **   *  * * * * *   *
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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

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***  *   ***   ***  
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int ****** argc, char *  {
*  ***   ** * *   char *** 
***  *    ** ** char * *  *
      *     ** *  char **   * 
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*  ** **** *** 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:  *** *   **** *
**   * **** 
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** **    * *  **    *   *** ** +3;
**  ***      * *  ** *    ** +3;
** ****  **** * **    * * +3;
**  * * *    * *   *** *  +3;
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*** * ** **  *  * 
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** * *** **** ***   ****  ** **  **** ***      * * * * ****  **    *   * 
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** ***   *   *** 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 **** * 
***** **    
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      ***   
 *   *   *     ***    * **  ****  * * * *  ** * *** *  *****  **** **     * * **  *   ****   * *  * **  *  **  
*  **  **    * 
 ****   **     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'