AND-operator

[jjude]

I read port B value=input_b();
I need only LSB-bit in B-port.
How i can work AND-operator?

This: value=input_b()&0x0f
or value=input_b()&&0x0f
or how???

[SherpaDoug]

The very best way to find out is to write a short test program using both and look at the assembly code generated.

The second best way is to look in a C primer book and read the differences between Logical AND and Bitwise AND.

The least best way is to ask here and have someone you don't know simply tell you that you should use value=input_b()&0x0f for the least significant nibble or value=input_b()&0x01 for the least significant bit.
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The search for better is endless. Instead simply find very good and get the job done.

[ckielstra]

I totally agree with SherpaDoug and would like to insert a third option, i.e. before asking on this forum:
3) Read the manual and study all available commands. Just so you know which commands and helper functions exist (you might have stumbled upon the bit_test() function).