[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.2k 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 | 5.2k 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:172.70.100.227
©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 | 806 views
12,783 questions
183,442 answers
172,219 comments
4,824 users