[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
6.4k 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 | 6.4k 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:172.69.130.71
©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 | 959 views
12,783 questions
183,442 answers
172,219 comments
4,824 users