I keep receiving an error message for the following code.
#define 1N4 8
Copied error message.
Arduino: 1.8.9 (Mac OS X), Board: "Arduino/Genuino Uno"
/Users/FETA/Downloads/Arduino.app/Contents/Java/arduino-builder -dump-prefs -logger=machine -hardware /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware -tools /Users/FETA/Downloads/Arduino.app/Contents/Java/tools-builder -tools /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -built-in-libraries /Users/FETA/Downloads/Arduino.app/Contents/Java/libraries -libraries /Users/FETA/Documents/Arduino/libraries -fqbn=arduino:avr:uno -ide-version=10809 -build-path /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686 -warnings=none -build-cache /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_cache_27765 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.arduinoOTA-1.2.1.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc-5.4.0-atmel3.6.1-arduino2.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude-6.3.0-arduino14.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -verbose /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_modified_sketch_35764/sketch_jul26d.ino
/Users/FETA/Downloads/Arduino.app/Contents/Java/arduino-builder -compile -logger=machine -hardware /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware -tools /Users/FETA/Downloads/Arduino.app/Contents/Java/tools-builder -tools /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -built-in-libraries /Users/FETA/Downloads/Arduino.app/Contents/Java/libraries -libraries /Users/FETA/Documents/Arduino/libraries -fqbn=arduino:avr:uno -ide-version=10809 -build-path /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686 -warnings=none -build-cache /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_cache_27765 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.arduinoOTA-1.2.1.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avr-gcc-5.4.0-atmel3.6.1-arduino2.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -prefs=runtime.tools.avrdude-6.3.0-arduino14.path=/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr -verbose /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_modified_sketch_35764/sketch_jul26d.ino
Using board 'uno' from platform in folder: /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr
Using core 'arduino' from platform in folder: /Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr
Detecting libraries used...
/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10809 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686/sketch/sketch_jul26d.ino.cpp -o /dev/null
/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10809 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard -I/Users/FETA/Downloads/Arduino.app/Contents/Java/libraries/Stepper/src /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686/sketch/sketch_jul26d.ino.cpp -o /dev/null
Error while detecting libraries included by /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686/sketch/sketch_jul26d.ino.cpp
/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10809 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard -I/Users/FETA/Downloads/Arduino.app/Contents/Java/libraries/Stepper/src /Users/FETA/Downloads/Arduino.app/Contents/Java/libraries/Stepper/src/Stepper.cpp -o /dev/null
Generating function prototypes...
/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10809 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino -I/Users/FETA/Downloads/Arduino.app/Contents/Java/hardware/arduino/avr/variants/standard -I/Users/FETA/Downloads/Arduino.app/Contents/Java/libraries/Stepper/src /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686/sketch/sketch_jul26d.ino.cpp -o /var/folders/ny/95ldknhs1wb_h3nl3yhktfcm0000gp/T/arduino_build_177686/preproc/ctags_target_for_gcc_minus_e.cpp
sketch_jul26d:6:9: error: macro names must be identifiers
#define 1N4 8
^
Using library Stepper at version 1.1.3 in folder: /Users/FETA/Downloads/Arduino.app/Contents/Java/libraries/Stepper
exit status 1
macro names must be identifiers