[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
6.3k views

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 /* */

[Exercise] Coding (C) - asked in Chapter 2: Syntax structure of the C language by (5.9k points)
ID: 26955 - Available when: Unlimited - Due to: Unlimited
edited by | 6.3k views

22 Answers

0 like 0 dislike 
Hidden content!
   *   ***    *    *   

int * *** argc, char ** *** {
  *   * **  ***  **  *   **   */

***     **  int number;
**    ** ****    char a;
 **** ***  **  * * *   *     b;
*       * * *   *   * * * *  c;
   **  ** ** *  *** *** **  d;
*  ** ** ***** * *  ****      * *  e;
   *  *     * *     *  * *
  ***  ** *  * *   * * forgert how to shift word  *   *          ** *** 
* * * **** **  *  *******  * **  * ** **** **** ***  ******       ** *  ***    *** * *
 * ***     ** 
** * *   *  * **    the message how??
  * *  *** * 
* *   *** **  * ***   * ******* * ** *   **** ******** 
*** * *     ** *  
**  ** *  *  *  * return 0;
}
100/100 answered by (449 points)
edited by
0 0
Case 0: Wrong output
Case 1: Wrong output
commented by (4.3k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
0 like 0 dislike 
Hidden content!
  *   * ** *        
*
 *  *  ** * * **  *      {

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

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

 *   *
 * *** *****
****  * 
* *  *
* *  * 
*
 **      *     **  *
*
100/100 answered by (153 points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
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;
}
100/100 answered by (281 points)
edited by
0 0
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.
commented by (5.9k points)
0 0
This exercise expects only 'hello'. However, your code has.....

printf("Put the words you want to decode:");

Kindly consider delete this part :)
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
* ***   * ***  *** *  ** 
 **          *  * *  *

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

*     **   

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

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

* *  ***** *        **** *
* *   * *******    *   *** * **  0;
}
100/100 answered by (273 points)
edited by
0 0
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'
commented by (4.3k points)
0 0
Your program can end at
  
    return 0;
}
------------------------------------------
You don't need to put

INPUT

ebiil

OUTPUT

hello
commented by (5.9k points)
0 0
Case 0: Correct output
Case 1: Wrong output
commented by (4.3k points)
1 like 0 dislike 
Hidden content!
  *  **   ** * 
** * **   **   *   *  * 

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

int ** *  * **  char   * *  {
 *   ***  * * *  int num, ***
 ** *   **    **     
**   **    
         *** *  *  * ***  ** **  *  * ***
* **  * ** *  * * for    = **** * *      
{
**       ** *  *    =  ** 
 ****    * ***  if * *  ***  **
 ****   *   * ***  *    * = *   *   **** 
******  * *  * *     **  **  *
}
 ****     *  * * ** **       ***    ** 
**   * *     0;
50/100 answered by (252 points)
0 0
prog.c: In function 'main':
prog.c:19:2: error: expected declaration or statement at end of input
  return 0;
  ^~~~~~
commented by (4.3k points)
0 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.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
     * * *  * *  ***
*
***  *  *****  *    * *  

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

** * * *  *    *
*
      **   *  **              *     **  **** ** ** *  **  ** * * ***
*
  = *  *
 
**  b +  *

  = c +   

 *  = d + *

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

*
100/100 answered by (268 points)
0 0
It's correct lol you can't judge me
commented by (268 points)
0 0
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.
commented by (5.9k points)
0 0
printf("%c%c%c%c%c", a1, b1, c1, d1, e1);

How's that?
commented by (268 points)
0 0
That's correct.
commented by (5.9k points)
1 like 0 dislike 
Hidden content!
 * **    ***  ** **** * *
**    ****  * *  **

int *  **  argc, char     {
 *     *  *  * ** char   ***
***  ** * * *   char *  **  
          * * char    * 
*  *   * ** * char     *
 **** *   * ** * char **  *
   *** *  *    
  * * * * *        *** ** **  input the letter to  * * ****** *
* * **    * *  
  *  *** *  * ** * *    *** *  * **  ** ** *      ******   *   *    *  * *  * ***   *  *    * 
 *  ** *** *      ***** = * ***  + 3;
 * *   **  **  * **    = * **** + 3;
   **   *  *         = **   *  + 3;
     * *****  * letterc =  *  + 3;
*** * * **     *     = *  *  + 3;
 **       ** *  
      *  **      ****  *     *    *  ****** *    *       ***** ** * *   *  ** 
  * *   *  *  
 * ** *   ** *** return 0;
}
100/100 answered
reshown by
0 0
-----------Re-judge-----------
Case 0: Wrong output
commented by (4.3k points)
0 0
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.
commented by (5.9k points)
1 like 0 dislike 
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
** * ***      **
100/100 answered by (269 points)
0 0
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.
commented by (5.9k points)
0 0
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'
commented by (4.3k points)
1 like 0 dislike 
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
***  ** **   ****   
  ******   **   **
*  * *
 * **  * *** * *
100/100 answered by (290 points)
reshown by
0 0
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.
commented by (5.9k points)
0 0
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'
commented by (4.3k points)
1 like 0 dislike 
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
100/100 answered by (271 points)
edited by
0 0
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.
commented by (5.9k points)
0 0
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'
commented by (4.3k points)
0 0
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'
commented by (4.3k points)
Page:
Welcome to Peer-Interaction Programming Learning System (PIPLS) LTLab, National DongHwa University
English 中文 Tiếng Việt
IP:172.69.130.62
©2016-2025

Related questions

0 like 0 dislike
2 answers
Shifting backward
[Normal] Essay (Open question) - asked Dec 12, 2017 in Chapter 2: Syntax structure of the C language by 許哲瑋 (449 points)
ID: 37081 - Available when: Unlimited - Due to: Unlimited | 955 views
12,783 questions
183,442 answers
172,219 comments
4,824 users