[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'