Use the matrix keyboard LCD1602 to achieve addition and subtraction multiplication and division functions the file ran on the board you can compile and download the project for the author to complete only for learning reference

Calculater
Calculater\Calculater.uvgui.喵咪先生
Calculater\Calculater.uvopt
Calculater\Calculater.uvproj
Calculater\key.c
Calculater\key.c.orig
Calculater\key.h
Calculater\key.h.orig
Calculater\lcd.c
Calculater\lcd.c.orig
Calculater\lcd.h
Calculater\Listings
Calculater\Listings\Calculater.m51
Calculater\Listings\key.lst
Calculater\Listings\lcd.lst
Calculater\Listings\main.lst
Calculater\main.c
Calculater\main.c.orig
Calculater\Objects
Calculater\Objects\Calculater
Calculater\Objects\Calculater.build_log.htm
Calculater\Objects\Calculater.hex
Calculater\Objects\Calculater.lnp
Calculater\Objects\key.obj
Calculater\Objects\lcd.obj
Calculater\Objects\lcd.__i
Calculater\Objects\main.obj
Calculater\Objects\main.__i

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