[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
8.3k 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 | 8.3k 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:104.23.197.94
©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 | 1.2k views
12,783 questions
183,442 answers
172,219 comments
4,824 users