[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'