[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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***   ****   *  
***  *    ** ** ** **** *** * **  ****   * * ** ***    *** *
** * **  * ** * 
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}

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 ** * *   ** ***  

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int main(int argc, char *argv[]) {
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**  **** **  **   *** * **  = b+3;
* ** * ** ** ** *  *   *  **  **** * *
** *   *         * **** **  = getchar();
**  ** ***   ****  ********    = c+3;
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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

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

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

*    *   *  * ****** *   ** ** * *   *  *  *      *** *  * *** 
a = a+3;
b = *
c =   
d = d+3;
e = * 

   * * the      *
** *  ** * *** * *
* *  *** *** *  ** * *  * *** *

*******  **  * 
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}

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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*  **          = * **** * * 
   **   *   ** *     * * *
}
*  ** **  * * *****  ***** *  * * **  **  *** ** 
 ***    ** ** * *    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 + *

** = 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

Hidden content!
* **** * ****  **    
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int   ****  argc, char  *    * {
*   * ** *     * char ** * 
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*   *****  ** ** 
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 ** **  ****** *     = * * ** + 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'