[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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**** * *  *    return 0;
}

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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#include ** * * *    ***

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int main(int argc, char *argv[]) {
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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;
e = *  

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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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}
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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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* ****  * *  * ***  **
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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  *** * {
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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 *** 
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***   * *   * * * 
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*  ****     * **   * ** *  +3;
*  *  *  ** * * *  *****   +3;
* ** *   **     *** *** ** +3;
** * *  ***   * ****    *   +3;
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***  **  *   ** 
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*    * *  * return 0;
}


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 * * ** 
  * *      *** * char  * *
**** * * * **  char  * * 
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 *   *    *  *  ** **** **   *   ** ** **      *        *****     **  ** **   *  * *  * ****** *   **
* *  ***  ** *  *  
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 * **   ******    * =   * * + 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;
        * ** * **    * *  
* *  **  **  *  *  * * * *    ** *  %c %c %c **   ***  **   * *  *             *** * ** * * *   *  **  * *****  *    
*     ** * ** *** * *    *   = 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'