AlliedModders - [TUT] Hexadecimal system

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[TUT] Hexadecimal system

Quote:

Originally Posted by Wikipedia

Hexadecimal system - In mathematics and computer science, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16.

I'll just tell you an usage of this system in PAWN.

I prefer this system instead of decimal system. Why?
It's easier to convert those integers to binary system which is used by computers. It also looks kinda cooler :P

Some examples of integers in HEX system

0xFF
0x10
0x25
0xA
0xAF

How to convert HEX integer into decimal one?
It is quite easy.

0x10

Just don't mind about this first zero. Imagine that x = 16.

0x10 = x(16) * 1 + 0 = 16

Just multiple first number after x (As I said imagine that x = 16)
The rest integers you have to sum.

We multiplied 16 by 1 and we add there a 0

Some more examples

0x21 = x(16) * 2 + 1 = 33

0xFF = x(16) * 15 + 15 = 255

Oh wait! What is this 'F' character?

In this system you can also use letters instead of numbers.

Code:

A = 10

B = 11

C = 12 

D = 13 

E = 14

F = 15

And now.. why I said don't mind about this 0 ?
Compiler detects that this integer is in HEX System by 0x at the begining.
You don't need to use this zero in conversion.

How would it look in a PAWN script?

PHP Code:


		
			
#include <amxmodx>

#define VERSION "0.1"

new const g_iHEX[] = {
        0x14,   //20
        0x25,   //37
        0x15,   //21
        0x05,   //5
        0x50,   //80
        0xA,    //16
        0xFF    //255
};

public plugin_init() {
        register_plugin("HEX TO DEC", VERSION, "diablix")
        register_clcmd("say /test", "cmdHexToDec");
}

public cmdHexToDec(id){
        new sMessage[0x80]; // 0x80 = 16 * 8 + 0 = 128
        new iMesSize = formatex(sMessage, sizeof sMessage - 1, "DEC READEN FROM HEX : ");
        
        for(new i = 0 ; i < sizeof g_iHEX ; i ++)
                iMesSize += formatex(sMessage[iMesSize], (sizeof sMessage - 1) - iMesSize, "%d ", g_iHEX[i]);
        
        set_pev(id, pev_effects, g_iHEX[5]); // 0xA = 16 * A(10) = 16

        client_print(id, 3, sMessage);
        
        return 1;
}

I could make some mistakes cause of my weird english. Sorry bros :crab:

Re: [TUT] Hexadecimal system

PHP Code:


		
			
new const g_iHEX[] = { 
     0x14, //20 
     0x25, //37 
     0x15, //21 
     0x05, //5 
     0x50, //80 
     0xA, //16 
     0xFF //255
};

0xA = 10, not 16

Your tut only covers hex values <= 255, which it is typically easier to just use decimals. You should also discuss how larger values are stored which I think will better explain hexadecimal.

You should post a link to a calculator so people can calculate they own values. Also, this link helps. Here's another.

Re: [TUT] Hexadecimal system

Quote:

Originally Posted by diablix (Post 1534229)

It's easier to convert those integers to binary system which is used by computers.

It's easier for who? Why would I need to convert to binary? I've rarely needed to know anything in binary. That's why I use a high-level programming language.

Quote:

Originally Posted by diablix (Post 1534229)

It also looks kinda cooler

Honestly, IMO, it just makes it harder to read.

Re: [TUT] Hexadecimal system

new sMessage[0x80]
this kind of stuff just makes ur code unreadable, code is for people to read, I don't see any cool thing to declare an array with hex as its size.

Re: [TUT] Hexadecimal system

I agree with you both, I would never use hex to replace simple numeric values just for the sake of using hex. Why use 0x13 when 19 will do? It would be especially confusing for those viewing code who are not versed in hexadecimal.

The only time I would agree with his statement is when working with bit masks. In this instance they are actually easier to use than decimal numbers.

1111 1111 = binary
255 = decimal
FF = hex

1111 0000 1111 0000 = binary
61680 = decimal
F0F0 = hex

1111 0000 1111 1111 1111 = binary
987135 = decimal
F0FFF = hex

Re: [TUT] Hexadecimal system

Quote:

Originally Posted by Bugsy (Post 1534270)

Could you explain 'bit masks' a little bit more and the usage in AMXX scripting?

Thanks.

Re: [TUT] Hexadecimal system

Quote:

Originally Posted by nikhilgupta345 (Post 1534288)

Could you explain 'bit masks' a little bit more and the usage in AMXX scripting?

Thanks.

Look into binary.
Bugsy also wrote a tutorial on bits.

Re: [TUT] Hexadecimal system

Thanks Bugsy, that's a really good point.

Re: [TUT] Hexadecimal system

You didnt explained about numbers higher than 0xFF like 0xF0FFF
So can you please cover this part as well ? other wise it will confuse people like me.

Re: [TUT] Hexadecimal system

what should it cover ? It's just a numeral system, nothing to explain on higher than 0x10