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##UPDATE

##UPDATE 2 You say,

UPDATE

UPDATE 2

You say,

(Duplicate of this.)

C++ has introduced another keyword, constexpr, which tells the compiler that an entire expression can be evaluated at compile time and reduced to a single constant value. Read all about it here.

(Duplicate of this.)

C++ has introduced another keyword, constexpr, which tells the compiler that an entire expression can be evaluated at compile time and reduced to a single constant value. Read all about it here.

PROGMEM tells the AVR compiler that, if storage is required for this variable, put it in FLASH memory (a special address range) instead of RAM (a different address range). Because of the AVR architecture, you must access FLASH differently, with special instructions. The include file has some routines (macros and inline assembler) for reading from those address spaces.

PROGMEM tells the AVR compiler that, if storage is required for this variable, put it in FLASH memory (a special address range) instead of RAM (a different address range). Because of the AVR architecture, you must access FLASH differently, with special instructions. Theavr.pgmspace.h include file has some routines (macros and inline assembler) for reading from those address spaces.