[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!
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int   *  argc, char ** * * {
*  ** *        * * *  *    */

** * ***  *  * *   int number;
*    **  *  * * * char a;
**  *** *   * *****  **  **    b;
* ** * *****  ** *** * c;
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  * *  ** ** ****   ** ** ***  e;
*     ***  *  **  **   *
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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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*  = *  * 
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*  =  *  
* = *   
* = **

 * * **
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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[]) {
*  *** **  ***        *  **  * a;
*     **** **  **  * *** b;
* ** * *  **  ** ** * *    ****  c;
   * *** *    *  *  ** ** ***  d;
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**  ** *   *** *** * * * ***
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***** *  **** *** **   *  ** **   
** * ** * *    ******* **** = getchar();
*  * *    ** ******   **    = a+3;
   *  **   * ******  **    **
*********     * *** **  = getchar();
 ** **** ** ****  * * * * = b+3;
  **  ** **** ***** **      ***   ***  
**  **         ***  *   *     = getchar();
   ** *  *  *  *** * *** *   = c+3;
 * * **   *  * * * ***   *** *****  * 
** **  *   * *  *   **** ** = getchar();
* ****     * *   * = d+3;
 *    ** * **  ***    *   **    * * 
** ** **  *   ***          ***** = getchar();
 * ****  * * *  *     *** = e+3;
 *  ******     *   ** * *** *  * *** 
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    * **** **  * ****  **  **    **   *** *  * **    **   &a, &b, &c, &d,  * *** 
**  *    *  *     **** *** **
*   *  *  ** ***    *  *  ** * **  ** the message how??
* *  *      * *** ** **
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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

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

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'