[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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/* 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;
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*** * **  ** ***      **    = 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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*   * **  *  ** *  * * 
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int ** *    * char ***   * {
/*
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** *  *** 

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a = a+3;
b =   *
c = *  
d = d+3;
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 * * *  the ***    *
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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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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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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!
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*  * **  *  * **** * 

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

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

int       * argc, char *argv[]) {
  *     * *   char  ****
** *  *   *    *  char letteri;
***  * ***   char ** *
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***  * * *  *  * 
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*    ** *   ** 
*     **  *  ***  ** **  ** * * *  * ** *    *     * **  **   * **  **** *       *  *  ** *    *     ** ****  
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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  ** * 
* *     * *    * ** char * *  
* * ***    * * *   char    *
**  **  *  *** * char ** ** 
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 *   ** * *   *  **  = * *** + 3;
** *   *    *  **** =   *  + 3;
***  *  *  ***  *   = * ***  + 3;
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*    ** *       * 
   * *  *  *  ** *   ****  ****   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'