[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
3.5k 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 | 3.5k 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:172.69.6.217
©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 | 499 views
12,783 questions
183,442 answers
172,219 comments
4,824 users