[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
10k 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 | 10k 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:162.159.115.9
©2016-2026

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 | 1.4k views
12,783 questions
183,442 answers
172,219 comments
4,824 users