[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
5.6k 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 | 5.6k 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:172.71.203.113
©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 | 855 views
12,783 questions
183,442 answers
172,219 comments
4,824 users