[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.5k 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 | 4.5k 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:172.71.255.17
©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 | 705 views
12,783 questions
183,442 answers
172,219 comments
4,824 users