[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5k 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 | 5k 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:172.69.17.131
©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 | 768 views
12,783 questions
183,442 answers
172,219 comments
4,824 users