[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
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 | 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:172.70.127.68
©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 | 617 views
12,783 questions
183,442 answers
172,219 comments
4,824 users