[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.9k 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 | 5.9k 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:172.69.59.97
©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 | 910 views
12,783 questions
183,442 answers
172,219 comments
4,824 users