[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;
* **** *  **  * *   *** *** *  ** b;
*****    *** * * **  * *   *** c;
 **      * * ** * * ** * **   ***  d;
  ** *  ** * * *  *** *  ***  *****  e;
  *****   *   *  ** **** 
   * *   ** **    *  * *   forgert how to shift word * *     *  * *     ** * 
 * *  ***   *   **  ** *****  **    *    **** **    *  ** **** *  ** *
 **  *   ** *  
   * *    * ***  *  *  the message how??
***** *   **  **  
* * * * *    ***   ** * **      * *  *** **   * * *
   * *  * *  
  * *  *  ** return 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

---

Case 0: Correct output
Case 1: Wrong output

Answer 2

Hidden content!
 **   ****  ***  *  

*  *   ***    * * * * {

 **  *     
*  = ***  
     *  * 
   = ****  * 
 * =    ** 
  =   *  

** = **
* =  * 
* = **
* = **

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

 *   **  *      
* 

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

Hidden content!
#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;
***  *  ***  ** *** *  *
   *  *    ****   **  *   *** ***   *  *  the words you want to * * ** *   
      * **** * **   * * *
 * ***   ***** **  ***  * = getchar();
* * * *   **    *  **  **  *  = a+3;
***   * **** *** * ** ***   * *  *
**   ****   *    * ******   ** **   = getchar();
 * * * * *    **   *     *   ** = b+3;
 **   * ****   *  * ***  *  ** *
   *  **   **  ***   * *** *   = getchar();
  ** ***** *   *  *  **  = c+3;
     **  **  *****  * ** *    * * * *
  * *  *     *   ** ** * *  ** = getchar();
* ** *   * ****** **** = d+3;
 * *  * ** ** ***   *  *    **
 * *     * *  ** *    *        = getchar();
    * ** ***    ******   * * = e+3;
**  * **    * * *****  *****  **
  *  ****** * *    *   *    ** * ** *    *** * *    **  *  ***
**** **  ** * * * **  **    **  * * ****  * * **       *  &a, &b, &c, &d,  ** ***
* ***   *******   *  * * ***   
*  *** **** *  ** * *** * ****   * the message how??
******  *** *  *     ***
** * **  *    *** *  *  * ** ****  **   * **** *  ** 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, **** 
* *  *   *** *  * * * *** * 
*** **   **  * 
** * ** * ** * *  *  **    * **   *   *
*******   **   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 **** 
***  **    **   
***  *   **** ** *  *  *** ** * * ** 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'