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Gentlemen, I am a novice C++ programmer, When I was trying to learn how to use EEPROM with Arduino, I came across this statement

i2c_eeprom_write_page(0x57, 0, (byte *)somedata, sizeof(somedata));

where I need to know what does (byte*) somedata mean?, please let me know if someone know the answer

Regards,

Mr.B

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  • external EEPROM? Commented Sep 7, 2019 at 16:43

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It means "Interpret this pointer as a pointer to byte data". It's called "Casting" and allows you to fool the compiler into thinking that one type of data is another.

For example, your function expects a byte * (a pointer to byte data), and if you have char * as your variable you can change it on the fly to byte * by casting it like that.

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  • Thanks Mr.Majenko Can you please refer me some material or website for me to learn more about this topic, It would be helpful . Thanks for the reply Commented Sep 7, 2019 at 16:25
  • tutorialspoint.com/cprogramming/c_type_casting.htm Commented Sep 7, 2019 at 16:39
  • Thanks Mr.Majenko Commented Sep 7, 2019 at 16:43

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