[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
6.7k 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 | 6.7k 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:172.70.126.77
©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 | 1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users