标签：Golang

以下摘自The Go Programming Language：

The increment statement i++ adds 1 to i ; it’s equivalent to i += 1 which is in turn equivalent to i = i + 1 . There’s a corresponding decrement statement i– that subtracts 1. These are statements, not expressions as the y are in most languages in the C family, so j = i++ is illegal, and the y are postfix only, so –i is not legal either.

要注意，i++和i--在Go语言中是语句，不是表达式，因此不能赋值给另外的变量。此外没有++i和--i。

以下摘自The Go Programming Language：

The import declarations must follow the package declaration.After that, a program consists of the declarations of functions, variables, constants, and types (introduced by the key words func, var , const , and type ); for the most part, the order of declarations does not matter.

import语句必须跟在package定义后面。请看下例：

package main

var str string = "Hello world!\n"

import "fmt"

func main(){
    // your code goes 
    fmt.Println(str)
}

编译如下：

./prog.go:5: syntax error: unexpected import

调整一下语句位置：

package main

import "fmt"

var str string = "Hello world!\n"

func main(){
    // your code goes 
    fmt.Println(str)
}

编译执行成功：

Hello world!

以下摘自The Go Programming Language：

Package main is special. It defines a standalone executable program, not a library. Within package main the function main is also special—it’s where execution of the program begins. Whatever main does is what the program does.

main package不同于其它library package，它定义了一个可执行程序。其中的main函数即是可执行文件的入口函数。