[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