[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.7k 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 | 4.7k 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:172.70.130.20
©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 | 741 views
12,783 questions
183,442 answers
172,219 comments
4,824 users