package main

import "fmt"

func main() {
	i := 10
	if i > 10 {
		fmt.Println("i > 10")
	} else {
		fmt.Println("i <= 10")
	}

	i = 6
	if i > 10 {
		fmt.Println("i > 10")
	} else if i > 5 && i <= 10 {
		fmt.Println("5 < i <= 10")
	} else {
		fmt.Println("i <= 5")
	}

	switch {
	case i > 10:
		fmt.Println("i > 10")
	case i > 5 && i <= 10:
		fmt.Println("5 < i <= 10")
	default:
		fmt.Println("i <= 5")
	}

	switch j := 1; j {
	case 1:
		fallthrough
	case 2:
		fmt.Println(j)
	default:
		fmt.Println("没有匹配")
	}

	sum := 0
	for i := 1; i <= 100; i++ {
		sum += i
	}
	fmt.Println(sum)

	sum = 0
	i = 1
	for i <= 100 {
		sum += i
		i++
	}
	fmt.Println("the sum is", sum)

	sum = 0
	i = 1
	for {
		sum += i
		i++
		if i > 100 {
			break
		}
	}
	fmt.Println("the sum is", sum)

	sum = 0
	for i := 0; i < 100; i++ {
		if i%2 != 0 {
			continue
		}
		sum += i
	}
	fmt.Println("the sum is", sum)

}