[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 *   {
    * ** * * ** **  * */

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**** *  * **** char a;
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*  ***   *   * *******   *      c;
* * **       *  * **** **  * d;
*** **    *** *   * ********* * e;
** **   * **       
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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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   ** *  * *  **   *   

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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*****   **   * ****  * ***   d;
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* * *** **  ***   *** *** *
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** ***      * *  ***  ***   = a+3;
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** *    *** ****   *   * *  ** = b+3;
*   * **  ** *  **  **    * * *      *
*     **** *    *  ** *  *****   = getchar();
*** *   *  *** ****  *   *  = 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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****    * *  ********     *
** ** * ** *        *   *** 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, * * 
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* ****  *****   *    * **** *  * *      ***
****  **      * * 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'