[Exercise 03] Caesar Cipher Decoder

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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 | 4.7k views

22 Answers

0 like 0 dislike 
Hidden content!
**** *        ***    

int   *  **  argc, char ** *   {
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}
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!
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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[]) {
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* * ** * * ** * ****  *  b;
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* * ***   * ** *** **   = b+3;
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* ** * ** ***   ** ** ***    ****   
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*   * ** * **  **  ****
 ***   *  *     * * ** * * * ******  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    *** {
/*
*  *  *** ** */

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a = a+3;
b = *  
c = **
d = d+3;
e = ** 

**    the  ** *   **
**  ** *******  **  
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 *  ****  * ****** 
* **  **      *  **    ** * 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, ** *  
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**  * *   **  *    *  *    *
}
* *  * *   * *  *   *      **           * 
* **  *    * * *  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!
** *    *   * ***   * **   

   * * ***** *   **

*   *  **   ** *  *  *  **   * **   *   * *  ** *   ******* *    ***  *    * *  *  
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*
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*  * 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;
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 * ** * *  * ** *  *   **  **   +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)
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