[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:172.71.1.131
©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