[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'