What are numbers with that $ ?

[nathan78]

What kind of numbers are that?

i.e. $00000100

Why not normal numbers?

[Shield]

These are hexadecimal numbers, meaning numbers to base 16 instead of 10.

[spikey]

http://en.wikipedia.org/wiki/Hexadecimal

Hexadecimal notation bears a more obvious relationship to the underlying binary used by the microprocessor than does decimal notation - each hex digit translates to a group of 4 binary digits. Once you get used to working with it, it offers some efficiencies for programmers.

[nathan78]

I asking myself why not using 256 instead $00000100.Because its the same.

And $1800 is $00001800 or $18000000?

[spikey]

At the risk of repeating myself - hexadecimal notation bears a more obvious relationship to the underlying binary used by the microprocessor than does decimal notation.

You can transcribe your example $1800 - always starting from the right hand (least significant digit) end - as:
0000 0000 0000 0000 0001 1000 0000 0000 in binary - its much harder to make the same transcription from a decimal number.

[srod]

Aye, when dealing with bitwise operators, raw binary or decimals are simply too verbose. Hexadecimal is a great compromise.

Take RGB colors for example. The color value 15790320 means nothing to me. Convert to hexadecimal, however (which equates to $F0F0F0) then we quickly see that the intensities of red, green and blue are all equal, meaning we have a shade of grey here. This is but one example of how useful hexadecimal can be.

[luis]

I thought $100 meant something was costing one hundred dollars

[HeX0R]

I thought $100 meant something was costing one hundred dollars

No, in fact it will cost you 256 dollars

[TI-994A]

I asking myself why not using 256 instead $00000100.Because its the same.

Hi nathan78. You're absolutely right; you can safely use either one in PureBasic.

And $1800 is $00001800 or $18000000? (leading zeroes are ignored)

As with decimal numbers, the leading zeroes are insignificant. You can easily check hexadecimal values with PureBasic's Val() function, like this:

Code: Select all

Debug Val("$1800")      ;6144
Debug Val("$00001800")  ;6144 
Debug Val("$18000000")  ;402653184

[TI-994A]

Take RGB colors for example. The color value 15790320 means nothing to me. Convert to hexadecimal, however (which equates to $F0F0F0) then we quickly see that the intensities of red, green and blue are all equal...

Hi srod. Right as always, although it should be noted that such hexadecimal values are not representational of the conventional R-G-B arrangement.