[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
2.4k 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 | 2.4k 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:172.69.58.200
©2016-2024

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 | 348 views
12,783 questions
183,443 answers
172,219 comments
4,824 users