[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
9.2k 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 | 9.2k 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:104.23.197.94
©2016-2026

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 | 1.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users