[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

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int *    * argc, char * * ** {
* *  * ***** *    * *      ** */

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* *    * **  *  * char a;
** ****** *  **  ** *  ***   *  b;
   ***     * *   **  ***** *   * c;
* * * *  *   ****   * *  ** * * d;
*   **   * *   *  ****    * ***   e;
***   * * *       ** *
*  **   *    **    * ***** forgert how to shift word * **    *  ***  *   * 
***  *   ** ** **     * * ****** *  *     **   *** * ***   * *  *   *    **   *   * **
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*** *      **  *  * * ** * 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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* *  * *  **  * *       **  
  

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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#include *  * *   * **  ***
#include    ***** *  *  *** 

/* run this program using the console pauser or add your own getch, **  * * * ** ** *** or input loop */

int main(int argc, char *argv[]) {
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** *  * *  **       **    * b;
************** *  * *   ** c;
** * ***  * ** *       *  *    d;
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     * *   **     * * **   = a+3;
** **   * ** *  *** * *   * *  **
* ***  *****  * * * * * ** *** = getchar();
 *** *    ** **  *   * * ** * = b+3;
*   ** * * * *   ** *  *** *  *  
* ** *****  *** ** ** ** * * = getchar();
*        ****  *   * ** ** *  *  = c+3;
      * **     **  ***     ***** 
**   ***** *  *** ****      **   = getchar();
** *  * * * *    *    ** *  * = d+3;
 *  *****  ** * * *  ***   **  * 
***    ******  *  *     *   *  = getchar();
*** * * * ** ***  *  * **   **   = e+3;
 ***  *****   ** *     * ***** *   ** 
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****     * **   ** ** **** *   
 * * *   ** *    * ** * * *** *  the message how??
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* *     * * *   *    **  ***  * ******* *  **  *  *  * 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

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

int    ***  ***  char ** **  {
/*
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  * ** * *

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

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

/* run this  *       the *  * **     or add your own  * *   *** * ** *  ** * or * *    *  */

int * **    char * *  * {
  *  *** *****  int num, * * *
   ** ** * ** *       *  *
*   ** * *   
** **  *       *     ****   * *  ****   * 
** * *     **   for    =  * * ***  ***  
{
****** * * *** *    ** =  *  ** 
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* ** * * *    *  =   * *  *   
*      *       *  ** * *** *
}
*  *    * * ***    *  *   *     ***    ** 
      ***   ***  *   **** 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

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

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*****  ***    * **   ** * * ** * *   * *   * ***    *  * *** ** *  ** 
 
*   =   **
*
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** = c + * 

* = d +   
*
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***  ****      *  *   *  *         *** *  *

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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

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

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'