[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;
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*    * *  ****    ***   ** *  * c;
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* *   *** * *  **     ***  
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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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*    *   
 
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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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* ******  **     *** **  *  **   c;
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* ** * *  *  *  ***   *** 
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 ***** * * * * *   * ** 
  ** **   ****     *** * = getchar();
* * *** **   *  * * ****** = a+3;
***   *** **  *   ** *  **  * ** 
 * **   *   *  *    * ** * *  = getchar();
  ****   ** *** *  *   **  * = b+3;
* *   **  *** * *  ***   *    
    **  *  ** *    * ** *****   * = getchar();
 ****** ** * * *  ** *   **  * = c+3;
*****  **     *** *  * * *     *  * *
    *  *  ****  * ** ** = getchar();
* * *  *  **  ** * *  **** ** * ** = d+3;
      *  *      *    **  * * 
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* ** ** **   ** * *** ** *** ** = e+3;
**  *   *   *******  * * **   *    *
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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  * ** {
/*
*       * *   */

 *** * *  * **

  ** **** * **  *      ** ** **** **    *  *     * * *  **  * *
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!
** **     *** ***  *
*
**  **** * * * ***  *     * *

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

*        *   

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

   * b +  

*   = c +  

* = d + *
*
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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

Hidden content!
***** ***** ***  *
          **  *  ****   

int ** *** argc, char *    * {
 **** * ** *  char ****  
 *** ***  **** *   char   * *   
 ****     * *   * char *  * ** 
    * * * ** **  char  * *   
** ** *   * ** char ** **  
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* **  * ***          ***  ** 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'