Go函数的使用示例教程

package main
import (
	"fmt"
	"strconv"
)
// 返回多个返回值，无参数名
func MultFunc1(a int, b int) (int, string) {
	a = a + 1
	b = b + 1
	//数字转字符串
	itoa := strconv.Itoa(b)
	return a, itoa
}
// 返回多个返回值，有参数名
func MultFunc2(a int, b int) (r1 int, r2 int) {
	//形参有默认值 是0
	fmt.Println("形参r1: ", r1, "r2: ", r2)
	r1 = a + 1
	r2 = b + 1
	return
}
func MultFunc3(a int, b int) (int, int) {
	a = a + 1
	b = b + 1
	return a, b
}
func main() {
	var a, b = MultFunc1(1, 2)
	fmt.Println("a=", a, "b=", b)
	var c, d = MultFunc2(3, 4)
	fmt.Println("c=", c, "d=", d)
	var e, f = MultFunc3(5, 6)
	fmt.Println("e=", e, "f=", f)
}

package lib1
import "fmt"
func init() {
	fmt.Print("我是lib1")
}
func Lib1Test() {
	fmt.Println("lib1Test")
}

package lib2
import (
	"fmt"
)
func init() {
	fmt.Print("我是Lib2")
}
func Lib2Test() {
	fmt.Println("lib2Test")
}

package main
 
import (
	"fmt"
	"goProject/aaa/lib1"
	"goProject/aaa/lib2"
)
 
func init() {
	fmt.Print("我是Lib3.go")
}
 
func main() {
	lib1.Lib1Test()
	lib2.Lib2Test()
 
}

package main
import "fmt"
// 值传递
func Swap1(a int, b int) {
	var temp = a
	a = b
	b = temp
}
// 引用传递
func Swap2(a *int, b *int) {
	var temp = *a
	*a = *b
	*b = temp
}
func main() {
	a := 1
	b := 2
	Swap1(a, b)
	fmt.Println("值传递 a=", a, "b=", b)
	Swap2(&a, &b)
	fmt.Println("引用传递 a=", a, "b=", b)
}