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[Go]小数点第Nで四捨五入する

概要

小数点第2、第3...と四捨五入する方法。

floatからstring

sample.go
v := fmt.Sprintf("%.2f", 12.3456)
fmt.Println(v) // "12.35"

v = fmt.Sprintf("%.3f", 12.3456)
fmt.Println(v) // "12.346"

floatからfloat

sample.go
v := 12.3456
fmt.Println(math.Round(v*100) / 100)   // 12.35
fmt.Println(math.Round(v*1000) / 1000) // 12.346

参考

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Help us understand the problem. What are the problem?