[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

Hidden content!
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int  ** *  argc, char *  ** {
***  *     * ** *   * *  ***** */

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*  *  *   **** * char a;
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*** *   * ***** * **** *  * * c;
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* ***** *  *  **  
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***** * *  * *  
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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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**** *** *** *    *      * {

* *    *
* = ***  *
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** = *  **  
** =    *   
*  =  ***

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** =    

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***  ** 
** 
***** **
***   
*
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Comments

Case 0: Correct output
Case 1: Wrong output

Answer 3

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#include  **  **** *    
#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;
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 * *** **   **   **   **   ** d;
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   **  **    **  **  * *  = getchar();
   ***  *      * *  * *   = a+3;
* **   * **   **             
 **  ** *** *    * ** ** *   = getchar();
**  ****   * ***  ******* *   = b+3;
 **  * *  *  * **  ** * * * * * *
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*** ******  * *** *  *  ** ***  = c+3;
  *  ***** **** *** *********** *  ***  *
* ***  ****** * *  ***   = getchar();
  **  **** *   *** * ****   *  * = d+3;
  *    ** ** * **** **    ** *
* ****  * * ** *   **  * * = getchar();
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* *     * * *** ***   * * **   * *  
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* **** *   * ** *  * ** * ** **        *** *   **      &a, &b, &c, &d,  * *  
***  **   * * **    ****  ** *
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*    * *  * ** ***** *  **** * *   0;
}

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

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

int *  * *    * char     * {
/*
   **  * *  *** */

**  *    

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

 *     * the  *  *     
***  * ****     **  
* ******  * * *  * *** *    * *

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

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

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

int ***     *  char    **  {
*** ** * *  *** int num,  ** *
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*  * *         *       * * **       **   *  
*  ** *    ** ** for  *  = ** *  *       *   
{
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*****   ***    if **   *  * 
 *  * *      * *   *  = **  *    
  **    ** ***   * * *  * 
}
*****   *******     *** * ******   *  *** ** **
   ** **   *  *  *    * * 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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**  **  *  *      *
*
 *   ****  * **   *  *** *  **  * ***  * ** *  ***** **   *   ** * * 
 
 ** = *   **
 
 *   b + *

** = c +  

* = d + *

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

* *  
 
  

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 * ** 
 *     *  **    char **  **
  *  **  * *  char   * *
***  *    *  *  char * ** *
***    *** *  * * char ** * *
  * *   *******  
 *    * * *   *** * *  **  input the letter to  * ** ** **
***** ** * *   * 
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* *** *  * ** ** **     * = ****  + 3;
    *  **   ** *  *  =    ** + 3;
**  * ****** * *** =   * + 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    ***
   * *  ***    
  **  ********  *  * **   *  *** * input the letter to encode:  **  * **  ** 
 * ** **  ****  * 
 **     *  *  ***    * * *        * ****  * **  * ***  * *   ***        **  *  *   ** ****  * * 
   * ** ** * * * * **   +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 * * **
  ** **     **  char  * * 
*   *     **  * char    *  *
 *  ** *   ** 
**** ** *   *  * *  *  **  ** * * 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'