[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
9.4k 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 | 9.4k 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:104.23.197.65
©2016-2026

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 | 1.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users