[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
9.4k 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 | 9.4k 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:104.23.197.64
©2016-2026

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 | 1.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users