Demostration of decimal arithmetic in Go

Starting point

Normal Version (Using Floating-Point Arithmetic):

go test -v -run TestNormalFourDigitSum

Fixed Version (Using Decimal Arithmetic):

it fixed some precision issues due to the limitations of floating-point arithmetic

go test -v -run TestFixedFourDigitSum

Go rounding behavior

go test -v -run GoRoundingBehaviorFloat64

Currency exchange

go test -v -run TestNormalExchangeUSD2JPY

go test -v -run TestFixedExchangeUSD2JPY

Sales tax calculation

go test -v -run TestNormalWithholdingTax

go test -v -run TestFixedWithholdingTax

Pharmaceutical dosage calculation

go test -v -run TestNormalDosage

go test -v -run TestFixedDosage

Geographic distance calculation

go test -v -run TestNormalGeographicHaversine

go test -v -run TestFixedGeographicHaversine