小记一下go的语法，风格

• 关于Exported names ，首字母不是大写的都不能作为输出。也不能被导入到另一个包中然后使用。
• int型在32位系统上为32位，在64位系统上为64位，和C一样。
• Variables declared without an explicit initial value are given their zero value.变量未被赋值时：0 for numeric types,
  false the boolean type,and
  “” (the empty string) for strings.
• import ：在同时引入多个包时，可以放在括号中。如

import ( "fmt" "math" )

• Type conversions:类型转换 The expression T(v) converts the value v to the type T. 类型转换时，必须显式转换，Unlike in C,in Go assignment between items of different type requires an explicit conversion.
• Type inference: the variable’s type is inferred from the value on the right hand side.
• fmt.Printf() fmt.Printfln()(输出行)

• Constants:
  Constants are declared like variables,but with the const keyword.

  *Constants can be character,string,boolean,or numeric values.*
  
            *Constants cannot be declared using the := Syntax.*

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