Golang如何获得小数点后两位的长度？

Question

From the source below, I want to get float type result 33.33. If use fmt.Sprintf("%.2f", v) can work well. But want to get the result in the floatTest function. How to do?

func main() {
        v := floatTest(30, 90)
        fmt.Println(v)
        // 33.33333333333333
        vv := fmt.Sprintf("%.2f", v)
        fmt.Println(vv)
        // 33.33
}

func floatTest(count float64, total float64) float64 {
        return (count / total * 100)
}

Answer 1

Multiply by 100; truncate via int conversion; convert back to float32 and divide by 100:

func precision2(f float64) float64 {
    return float64(int(f*100)) / 100
}

https://play.golang.org/p/jbsdeQKgJji

This link has examples using the math package - but I generally try to avoid including packages for trivial operations.