[Exercise 03] Caesar Cipher Decoder

Question

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 /* */

Answer 1

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}

Comments

Case 0: Wrong output
Case 1: Wrong output

---

Case 0: Correct output
Case 1: Wrong output

Answer 2

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Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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** * * **** * *  *  *    * = d+3;
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}

Comments

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.

---

This exercise expects only 'hello'. However, your code has.....

printf("Put the words you want to decode:");

Kindly consider delete this part :)

Answer 4

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*   ** *   * *** **** 
**   * ** ** * **  *

int ** *  * char **   {
/*
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a = a+3;
b = * 
c = ** *
d = d+3;
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 **  * ** * ** ** * 
*   ***      * **  *   * ** ** * ** 0;
}

Comments

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'

---

Your program can end at
  
    return 0;
}
------------------------------------------
You don't need to put

INPUT

ebiil

OUTPUT

hello

---

Case 0: Correct output
Case 1: Wrong output

Answer 5

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*        * ** *   ** ** *
*** *   * *   ** ** *

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}
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**  **     **   *** 0;

Comments

prog.c: In function 'main':
prog.c:19:2: error: expected declaration or statement at end of input
  return 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.

Answer 6

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Comments

It's correct lol you can't judge me

---

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.

---

printf("%c%c%c%c%c", a1, b1, c1, d1, e1);

How's that?

---

That's correct.

Answer 7

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*  **   ** *  *** *   *
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int  *   * argc, char     {
***   * *  **  * char  * *
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*** * *   **    ** * = *  *  + 3;
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}

Comments

-----------Re-judge-----------
Case 0: Wrong output

---

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.

Answer 8

Hidden content!
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*   *  * *  ** *    **

int * * argc, char *argv[]) {
   *  * *  *  char *  
* * **  **   ** char letteri;
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**    *      *   char * * * *
***  ***  ****  char   ***
 * * * **  ***   * 
* * ***   **** **   *  *** * * input the letter to encode: ** ****     **
** ** *      
*    *   ****  * ***     ***** ****  *      *** ** ** * *  **   ** *  ****   * *   *   * * **  **    **   
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**   ***  **  ** *** *   * +3;
****  *        *** *   *  *  *** +3;
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*   * * *   *  **  ****  +3;
*  * *  ** **   
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}


INPUT
**   **  *  **  *** *
 *** * * ***** ** 
OUTPUT
*  ***   *** * * 

Comments

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.

---

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'

Answer 9

Hidden content!
  * *   ** *    ***
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int  ** argc, char     ** {
 * **  ***  *** char ** 
    **       char  * 
  *  ***   **  * char * *
*   ***    **  ** char **   
*   ** * *   * char *  ** 
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** * * ***  *   * 
*  * **  *  *  * * **  *   **   ***  ***   * * **   * *  ** *  ***** *** * *  **   **    * ** ******** * 
*   **   *  *   * 
***** * * * **  letter = letter + 3;
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**   *  **   *      *   * =    * + 3;
  *** *  * * *   ** = * ** * + 3;
***     * **** * 
***  *  ** ***  ***  *********  **   *  letter is  *   * *** * *   * * *  ***         * **  *  **
*** ** *       
* **   *       return 0;
}

INPUT
* * ** **   *** * 
   **  ** *    
***    
 *   ** *    **  

Comments

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.

---

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'

Answer 10

Hidden content!
#include *** ****  * * *

int main(int argc, char *argv[]) {
* *  **   ******  **    *     lettera;
**  ** * **  *   *   *** letterb;
  *    * * **  *   *   * *   letterc;
***        **** ** * ****** letterd;
* ***    * ****    * ** ****  lettere;
  *  ***   ** * * ** *   *
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**** *   ** ***     *   ****   = lettera + 3;
*** * *  **  *      *** *****  = letterb + 3;
  ****  * *** * *   *   ****  = letterc + 3;
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** *    *  ****     ***  **  * ****  *   = lettere + 3;
**** ***    ** **  * **** ** * * * ****  *** **  * ***
****** ***  * ** *  * ********  * **  * **** *** %c %c %c *     **** *   * letterb, ** * * *   *  **   * 
 * *     * **     ** ** ***** ***
    *** * * *****  ** * *     ** 0;
}

**   
 *     
 **** * *  **  
*   
//hello

Comments

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.

---

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'

---

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'