[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
7.2k 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 | 7.2k 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:172.70.50.50
©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 | 1.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users