Go编程基础-基础篇 18

package main

import "fmt"

type iAdder func(int) int

func adder() iAdder {
	sum := 0
	return func(i int) int {
		sum += i
		return sum
	}
}

func main() {
	a := adder()
	var s int
	for i := 1; i <= 100; i++ {
		s = a(i)
	}
	fmt.Println(s)
}

5050

package main

import (
	"errors"
	"fmt"
)

func main() {
	t, err := devide(2, 0)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Println(t)
	}
}

func devide(a, b int) (int, error) {
	if b == 0 {
		return 0, errors.New("除数不能为0")
	}
	return a / b, nil
}

除数不能为0

package main

import "fmt"

func divide(a, b int) int {
	return a / b
}

func main() {
	defer func() {
		err := recover()
		if err != nil {
			fmt.Println("程序运行中出现异常：", err)
		}
	}()
	t := divide(2, 0)
	fmt.Println(t)
}

程序运行中出现异常： runtime error: integer divide by zero