[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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}

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 = ***

     * 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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*    * * *  ** * ** 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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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 ***  * {
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*  **  *  ***     * *  =     *** + 3;
**  *  ** *  **    *  * * =  *** + 3;
**** ***      *    ** =   *  + 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

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