[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  * *  {
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** * * *  * ** ** ***
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*  *    ** *  ** the message how??
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******    *  * *  *  *  * **  *       **   *   
  *   *     *   
 *   **  * 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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*****  * ***  *    

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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* * *  *        *** *  **  *      = b+3;
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**** *     * * ** * * *  = getchar();
*  ** *** *** **** *******    *  = c+3;
** **   ** ****  ** *   *   *      
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** * * **  ***  * * *** * **  **   = d+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

Hidden content!
*****   *** *****   
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int   * *   *** char  ***** {
/*
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a = a+3;
b =  ***
c =   * 
d = d+3;
e =     

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

*  * ***** **     
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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 ***  {
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** * ** *  *     *   ** ***      * * *  **
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{
**    **  *  *   *  = **** 
*  *  **  ***   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

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

*         *   * 

*  ** *** *   *    
 
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* =     
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*   = 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!
* *** *   *   *    *
**    *  * ** *  *  **

int **** argc, char   * {
**   *      ** char **   
   *  ** *      char **    
  *** * *  *** *** char  **    
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  *  *  **  * ** =  *  * + 3;
* * **  **  * *  = * *  + 3;
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   **  * ** ** * *    =  *  + 3;
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* ***  *  *  * * 
   *      ****  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 *
** ***    ***   ** 
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** *   * *** 
      ** * **   *****  ******   ******   *    *   ** ** *  **   *  ***  *** **** *   * *   *  *** *
* ** * **   * *   *      ** +3;
**   * * * * *    * **  **** +3;
  *  * ***   ** **    * *  +3;
    **  *  *** *  *  **** *** +3;
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* ***  *  **  
* * * *      
**    * *  * *  ***  ** ****      **     ** ***  **  *       * *  * *
***       ** 
 *  **  *  *  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'