[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
4.7k 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 | 4.7k 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:172.69.6.133
©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 | 730 views
12,783 questions
183,442 answers
172,219 comments
4,824 users