[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
3.7k 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 | 3.7k 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:172.70.131.208
©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 | 558 views
12,783 questions
183,442 answers
172,219 comments
4,824 users