[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
8.4k 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 | 8.4k 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:104.23.197.95
©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 | 1.2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users