go_tutorial/workspace/lesson8/method.go at tutorial · ming197/go_tutorial · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
package main

import "fmt"

type Circle struct {
	radius float64
}

func (c Circle) getArea() float64 {
	return 3.14 * c.radius * c.radius
}

func (c Circle) changeRadius(radius float64) {
	c.radius = radius
}

func (c *Circle) changeRadius2(radius float64) {
	c.radius = radius
}

func (c Circle) addRadius(x float64) float64{
	return c.radius + x
}

func main() {
	var c Circle
	c.radius = 10
	fmt.Println("radius=", c.radius, "area=", c.getArea())

	c.changeRadius(20)
	fmt.Println("radius=", c.radius, "area=", c.getArea())

	c.changeRadius2(20)
	fmt.Println("radius=", c.radius, "area=", c.getArea())

	result := c.addRadius(3.6)
	fmt.Println("radius=", c.radius, "result=", result)
}