Storing 3x 4bits to 12bits consecutive

[austfreddo]

Guys,

I am in need of help of how to combine three 4 bit pieces of data read in by a function to one consecutive 12bit piece of data.

the data would come in as

variable0=0010
variable1=1111
variable2=0101

How would I code the program so as once the seperate variables are obtained I can produce

variablecombined=010111110010

Any help would be much appreciated.

Regards,
Austfreddo

[Duthomhas]

This is where the bit-shift operators come in handy. You'll need left-shift: <<.

Start with a zero result, shift each piece into place, and add it into the result.

Hope this helps.

[austfreddo]

So would I be correct in stating that Var0 would not be shifted, var1, left shift 4 bits, var2 left shift 8 bits?

Would you care to provide a quick example Duoas? It would help out quite alot.

Cheers,
Brett

[Duthomhas]

Actually you have it exactly.

int two_hundred_fifty_six = 1 << 8;