[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
7.8k 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 | 7.8k 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:172.70.80.121
©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 | 1.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users