[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 number;
*        * char a;
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  * *   ** *   * *     * *   *   * c;
 ** * **   ****  ** *  **    * *   d;
** ** **  *** *   * **  * ** e;
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 *    * ** *         *  * * ** 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

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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;
 **   *     **  **   **   **   * 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'