[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.3k 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 | 4.3k 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:172.70.100.15
©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 | 681 views
12,783 questions
183,442 answers
172,219 comments
4,824 users