[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;
*  ***   * * * *  char a;
***  ***      *  * *  ** * ** b;
** ** * ****   *  *     * *  * ** c;
***   *   * **       * *  * d;
 * **   ** * * ***** *   ****** e;
      ***  * * **    * *   
  * **** **   *    *  *****  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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   ***   **** *      
*
 **  * * *  *    ** ** {

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

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

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

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[]) {
   *    * *  *     **** * a;
** ** *  ****** * *** *  ****     b;
*  *** ** ***  *   ****   * *  *  ***  c;
  ** *** ***** ** *  ** *  * d;
** * *****  ** * *  * ***     e;
***   *  *******     **    *
** ***** *   ****** **   *** **  *** the words you want to ****** ****
 *   **     * **   *   ***
     **  * ** * **** ***      = getchar();
**  *  * *   **  ****   * *  * * = a+3;
***  *  **       *    * ** * **    
       *  **  * **   *  *   = getchar();
*  * ** *** ** *** * = b+3;
 * ***   *    ***    ** **** * ***    
  *    *** *  *** * *  *  = getchar();
*  *** ********  * *   *   * *   = c+3;
 *  *  ** *  *** **     ** *  
***  ** *  **    ***   ****    = getchar();
 *   ** * * ****    *  **** **** = d+3;
**    * * *  ** *     * ** ***
***    * ** ***  * * * **** = getchar();
 *** ******  *  **  *** * = e+3;
*    * *** **     * **   * 
     *    **   ***  * *******  ** *      *** *  *  *  *  ***   
* ****   * **** ** ** * * *       *   *  ******    *      &a, &b, &c, &d,  * * ** *
 **   *    **   * *** * ** * **
***  * *****     * *** *****      the message how??
 *  ****      **** *****   * * * 
** *  ** *** *** *   * **   ** *** *  *   *****      * 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

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,  ****
* * **   ****   **  **
  *   * *  * **     
 *  *  ******      ****   *****       ** *
 * **  *  * * 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'