another problem occur... like
In file included from C:\Program Files\arduino-0021\hardware\arduino\cores\arduino/WProgram.h:6,
from sketch_jan26a.cpp:70:
c:/program files/arduino-0021/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected unqualified-id before 'double'
c:/program files/arduino-0021/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected )' before 'double' c:/program files/arduino-0021/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected )' before 'double'