基础语法-循环使用（9）

总体

代码

//demo_18.go
package main

import (
	"fmt"
)

func main() {

	person := [3] string {"Tom", "Aaron", "John"}
	fmt.Printf("len=%d cap=%d array=%v
",len(person),cap(person),person)

	fmt.Println("")

	//循环
	for k, v := range person {
		fmt.Printf("person[%d]: %s
", k, v)
	}

	fmt.Println("")

	for i := range person {
		fmt.Printf("person[%d]: %s
", i, person[i])
	}

	fmt.Println("")

	for i := 0; i < len(person); i++ {
		fmt.Printf("person[%d]: %s
", i, person[i])
	}

	fmt.Println("")

	//使用空白符
	for _, name := range person {
		fmt.Println("name :", name)
	}
}

输出

len=3 cap=3 array=[Tom Aaron John]

person[0]: Tom
person[1]: Aaron
person[2]: John

person[0]: Tom
person[1]: Aaron
person[2]: John

person[0]: Tom
person[1]: Aaron
person[2]: John

name : Tom
name : Aaron
name : John

循环map

//demo_20.go
package main

import (
	"fmt"
)

func main() {

	person := map[int]string{
		1 : "Tom",
		2 : "Aaron",
		3 : "John",
	}

	fmt.Printf("len=%d map=%v
", len(person), person)

	fmt.Println("")

	//循环
	for k, v := range person {
		fmt.Printf("person[%d]: %s
", k, v)
	}

	fmt.Println("")

	for i := range person {
		fmt.Printf("person[%d]: %s
", i, person[i])
	}

	fmt.Println("")

	for i := 1; i <= len(person); i++ {
		fmt.Printf("person[%d]: %s
", i, person[i])
	}

	fmt.Println("")

	//使用空白符
	for _, name := range person {
		fmt.Println("name :", name)
	}
}

for

for i := 1; i <= 10; i++ {
		if i == 6 {
			break//continue
		}
		fmt.Println("i =", i)
	}


func main() {
	fmt.Println("begin")

	for i := 1; i <= 10; i++ {
		if i == 6 {
			goto END
		}
		fmt.Println("i =", i)
	}

	END :
		fmt.Println("end")
}