[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.9k 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 | 5.9k 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:172.69.6.172
©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 | 902 views
12,783 questions
183,442 answers
172,219 comments
4,824 users