[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.9k 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 | 5.9k 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:172.69.130.71
©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 | 907 views
12,783 questions
183,442 answers
172,219 comments
4,824 users