[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.7k 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 | 5.7k 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:172.70.111.109
©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 | 888 views
12,783 questions
183,442 answers
172,219 comments
4,824 users