3.3 Go Float

1.Go float

Go language offers two precision floating point, float32 and float64, the compiler defaults declared float64

Decimal decimal type is stored, such as1.2 0.005 -2.32

package main

import "fmt"

func main() {
   var price float32 = 100.02
   fmt.Printf("price类型是：%T，值是%v", price, price)//%T 类型  %v 默认值
}

1.1.1. Float form

浮点数=符号位+指数位+位数位

package main

import "fmt"

func main() {
    var price float32 = 11.22 //正数符号
    fmt.Println("price=", price)
    var num1 float32 = -3.4 //负数符号
    var num2 float64 = -8.23
    fmt.Println("num1=", num1, "num2=", num2)

    //尾数可能丢失，精度缺损
    var num3 float32 = -123.11111111105//精度丢失了    
    var num4 float64 = -123.11111111105//float64的精度高于float32
    fmt.Println("num3=", num3, "num4=", num4)
    //输出结果
    //num3= -123.111115 num4= -123.11111111105
}