[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.6k 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 | 4.6k 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:172.71.255.49
©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 | 720 views
12,783 questions
183,442 answers
172,219 comments
4,824 users