[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
7.9k 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 | 7.9k 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:172.70.80.5
©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 | 1.1k views
12,783 questions
183,442 answers
172,219 comments
4,824 users