[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
9.3k 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 | 9.3k 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:104.23.243.108
©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