pic16f88 PIN_B4 problem

[digifuzyon]

I use pic16f88 for addressing. I use 4bit switch but PIN_B4 doesn't work.

When PIN_B4 equal to 1 then A2 goes 1.
When PIN_B4 equal to 0 then A2 goes 1.

State of A2 doesn't change.

[PCM programmer]

1. Post a complete test program, which shows the #include, #fuses, #use
delay(), and main(). But keep it short. Here is an example of a short
test program:
http://www.ccsinfo.com/forum/viewtopic.php?t=30109&start=1
Don't put any unnecessary code in the test program.

2. Post your compiler version. It's a 4-digit number in this format:
x.xxx
You can find it at the top of the .LST file, which will be in your project
directory.

3. Post a description of the external circuits connected to pins B4 and A2.
Include the component values.

4. Post if you are testing this program with real hardware, or is this a
Proteus project ?

[digifuzyon]

Thanks for your interest.

I found mistake . solder of resistor which between PINb4 and ground is very thin.