[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.3k 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 | 4.3k 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:172.69.6.197
©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 | 676 views
12,783 questions
183,442 answers
172,219 comments
4,824 users