[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
3.5k 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 | 3.5k 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:172.69.6.217
©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 | 499 views
12,783 questions
183,442 answers
172,219 comments
4,824 users