[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
6.4k 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 | 6.4k 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:172.69.17.58
©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 | 958 views
12,783 questions
183,442 answers
172,219 comments
4,824 users