[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
6.4k 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 | 6.4k 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:172.69.214.38
©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 | 960 views
12,783 questions
183,442 answers
172,219 comments
4,824 users