In this project we have quite a good calculator that supports all main operations like: + - * % with integer and float numbers and even it can calculate Sin(x), Cos(x), Tan(x) and Cot(x) for all angles. This is a two line calculator that shows you what you are entering just like scientific calculators and of course it is as fast as them. You can also do multi operations at the same time. Accuracy is really acceptable due to using float numbers and also it can do some conversions for some units like :
inch-->mm
mm-->inch
ft-->m
m-->ft
F-->C
C-->F
Cal-->J
J-->Cal.
ft-->m
m-->ft
F-->C
C-->F
Cal-->J
J-->Cal.
here is the program in Codevision:
here is the schematic in Proteus:
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