Significance of underscore in binary number.

Franklin

I'm not sure I understand the significance of the underscore in the binary number in this code.

 bs2.shiftout(MOSI,SCK,%000011_10,BS2#MSBFIRST,8)  

Could someone explain? Thanks.

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- Stephen

Post Edited (Franklin) : 5/27/2007 1:35:33 AM GMT

codemonkey

Underscores in constants are just placeholders, useful to people, ignored by the compiler/interpreter/assembler.

Graham Stabler

Good when you write out an entire 32 bit number, it lets you find where you are easily.

01001010_01001010_01001010_01001010

Rather than:

01001010010010100100101001001010

Same goes for hex

FFFF_FFFF

Sometimes they can be used when a number has different bits for different tasks, you split with an _ to make it clear.

Graham

Post Edited (Graham Stabler) : 5/27/2007 2:29:59 PM GMT

Franklin

Thanks, I suspected the underscore might have been a marker because of the context but wasn't sure. the last two bits in this byte signify read/write and the last one is always zero

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- Stephen