vb.net - programing ranging data -

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i have 2 inputs 0-180 x , y need add them , stay in range of 180 , 0 having trouble since 90 mid point cant seem keep data in range im doing in vb.net need logic 

result = (x + y) / 2

perhaps? @ least stay in 0-180 range. there other constraints you're not telling about, since right seems pretty obvious.


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