[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