1.0

test/test4.go

+package main
+
+import (
+	"fmt"
+	"strconv"
+)
+
+func main() {
+	var a,b,c float64
+	a=1.69*100
+	b=1.7*10
+	c=a*b/(100*10)
+	//正确结果2.873
+	fmt.Println(c)
+	//fmt.Println(fmt.Sprintf("%.2f",c))
+   //fmt.Println(FloatRound(c,2))
+}
+
+
+// 截取小数位数
+func FloatRound(f float64, n int) float64 {
+	format := "%." + strconv.Itoa(n) + "f"
+	//fmt.Println(format)
+	res, _ := strconv.ParseFloat(fmt.Sprintf(format, f), 64)
+	return res
+}
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