[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
7.3k 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 | 7.3k 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:172.70.80.196
©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