[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;
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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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* ***  
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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[]) {
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*   *  *  ****  * **  ** * *  c;
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**  *    ****    *     ***    e;
** *** ******   ** *** ***
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*** ** ** ***  *  *   * *** * *
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*** *  ****** ***** * **** *  *  ****
*   **  *  * *  **** * * ** = getchar();
** ***        ** *   *      = b+3;
***   *   * *  *   *  ** ***** 
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****  * **   *** * * ** *  = c+3;
 *  *  * *  * *  **   *  * *   ***
*** ****    *  * * * *   ** = getchar();
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 ** *****  **    **   **     
**  * ****  *****  *       = getchar();
*  * *** *    ***   **   *** = e+3;
** **     **  *   ** ** ** ** * 
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* * *  *   * ****  *    * *      **   * * * *****       * &a, &b, &c, &d, *** * 
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**   *     * ***   *      
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}

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 *****  {
/*
   *   *   * */

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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

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

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

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

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

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

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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

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'