input command (newbie question)

i am new and i write the input code in microcode studio plus like this
i using PIC16F877A

define osc 20
trisa = %111111
trisb = %00000000
x var byte
start:
if porta.0 = 1 then
portb.0 = 1
else
portb = %00000000
endif
when i simulate in proteus 6, i got nothing at output LED
when i was pressed a switch in proteus, it got signal go in and the voltage is 5.33 after when at open switch i find that porta.0 pin still got voltage that is 3.44 wat is the problem
wat's wrong with my coding?

define osc 20
trisa = %111111
trisb = %00000000
x var byte
start:
x=0
while porta.0 =1 and x = 10
portb.0 = 1
x=x+1
wend
with this code i'am also cannot work so wat is my problem in input?
does my program write wrong?

Hi kctan,

Nothing wrong with the first example. Except there's no GOTO at the end to form a loop. (but you probably just missed it with the cut&paste) You might want to try it on a real chip, instead of a simulator.

However, in the second example.

Code:

---

x=0
while porta.0 =1 and x = 10
    portb.0 = 1
    x=x+1
wend

---

The "while" will never execute, because x = 10 will never be True.

Also, the code shown would be for PicBasic Pro, Plain PicBasic doesn't have a "while" command.

thanks you