[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 * **** {
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  *** *  *     int number;
*  * **  *  **    char a;
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 * *  ****   ****   *   *  * 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

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

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* =  **
* = *  
 * = *  

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

**       *  **** * ***   

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;
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**  **** ** *** *   **   *    * ** * ** ***   *  * the words you want to   *     * * * 
*    **  ***    *     * 
* ***  *******   ** **  *  = getchar();
  * **  *   **  * **** ***   = a+3;
****** *  ** * **  ***** * *
 *  ** *    * ***   * ***  * = getchar();
*   ***** * ***  **  **  = b+3;
** *** **    * ****  **  * **      
 **   *  ****  * *** ** *  = getchar();
  *  *** **         * ** * * = c+3;
* * *  *** * *  *     *** * **   **  
  *****       ****  *   *** = getchar();
**  **     *     *  **   * = d+3;
* * * ***     ***      *** * **** 
*** ***     * * *     ** *      * = getchar();
 *  *  * *** *     * *  = e+3;
** ** *** **    * * ***** * 
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** *   *   * *   ** ** ***  *** *  **** *****    * &a, &b, &c, &d,  **** **** 
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* *   ****    *       * * *  *
  *   *  *  *     * ** *   * ** 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'