[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 *** * * *   * *  

/* 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+3;
 * * *  ** * **** * ** * **** * *
*     *** *** ** *   * *     = getchar();
** ** *  ***    *     ** *** = 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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*   *        

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

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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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/* run this * *** * * the  * *   *   or add your own **  ******* * * *  * ** **** * **  or      */

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* *****    ***  *  int num,    ***
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****  *  ** * 
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**  *  * **  *    for  * =  *       * *** **
{
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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

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

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

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

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