[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
3k 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 | 3k 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:172.69.6.48
©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 | 425 views
12,783 questions
183,443 answers
172,219 comments
4,824 users