[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
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 | 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:172.71.254.148
©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 | 617 views
12,783 questions
183,442 answers
172,219 comments
4,824 users