[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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}

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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*** * ***    **   **
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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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int   *** * argc, char         {
* ****  *** ** char ***
*** *      * ** char  ** 
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******** *    *****  letterc = *  * + 3;
*  ***  ****    * = *  *  + 3;
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*  *   ****  * * **  *  **    *  *  ****  * ** ** *    **   ** ****    ****
*   *  *   * *  
** *    * * * * return 0;
}

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

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