[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
7.4k 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 | 7.4k 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:172.71.120.164
©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