[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
3.7k 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 | 3.7k 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:172.70.131.208
©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 | 558 views
12,783 questions
183,442 answers
172,219 comments
4,824 users