强制转化

type_name(expression)

例子

    sum := 100
	count :=6

	// int
	average1 := sum/count
	// float32
	average2 := float32(sum)/float32(count)

	fmt.Printf("average1 type =%T, value=%d \n",average1,average1)
	fmt.Printf("average2 type =%T, value=%f \n",average2,average2)

输出

average1 type =int, value=16
average2 type =float32, value=16.666666

自定义类型

格式

type $name struct {
    $field $type;
}

例子

type User struct {
	/** 首字母大写，允许其他包访问  */
	Name string;

	Province string;
   /** 小写开头，不允许外面的包访问，本包可以使用*/
	address string;
	age int;
}

类型别名

type (
	mystring string
)

例子

    var str mystring;
	str = "类别别名demo";

	str2 := str +"!!!";

	fmt.Printf("str type =%T \n",str)
	fmt.Printf("str2 type =%T \n",str2)

	var str3 string;
	str3 = "GoLang";
	fmt.Printf("str3 type =%T \n",str3)

输出

str type =main.mystring
str2 type =main.mystring
str3 type =string