[Exercise 03] Caesar Cipher Decoder

3 like 0 dislike
9.5k 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 | 9.5k 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:104.23.197.65
©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 | 1.3k views
12,783 questions
183,442 answers
172,219 comments
4,824 users