[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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int main(int argc, char *argv[]) {
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*  ****   ****     *  * *** = c+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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b =  
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d = d+3;
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* * * *   *   * * ****
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}

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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}
**  *  **    **     *   ** * * **  *  *
** *   * **** *    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

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

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

int * **    argc, char * *  {
*   *** * * * * char   * 
*   **    * *   char  **  
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 **    *  ** *   char    * 
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*          *   *  **     **  ****   * ** **  ****  ** *** *   *  *   **   *         * * *  *  * * ****
*      *   * *  
* *  * *    **    letter = letter + 3;
*****  **  *  ***  ***  =  ** + 3;
***  *     * * **   *  =    * + 3;
*    * *     ***** *  ** =  ** + 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;
        *** ** * ** ** **   = letterd + 3;
  * **  **  **   * ** * * *   * = 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'