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                # 變量定義 使用var關鍵詞,變量類型卸載變量名之后 ``` var a,,b,v bool var s1,s2 string ="hello","go" ``` 可以放在函數內,或直接放在包內 使用var()集中定義變量 ``` var ( a int b bool ) ``` 編輯器自動決定類型 ``` var f,g, h = 2,true,"h" ``` 使用:=定義變量,盡量使用該方式定義。只能在函數內使用 ``` var f,g, h := 2,true,"h" ``` # 數據類型 > bool,string > (u)int,(u)int8,(u)int16,(u)int32,(u)int64,uintptr > byte,rune > float32,float64,complex64,complex128 沒有char,只有rune 原生支持復數類型 # 數據類型轉換 ``` var a,b int =3,4 var c int =int(math.Sqrt(float64((a*a+b*b)))) ``` # 定義 ``` const file string ="abc.txt" ``` const數值可以作為各種類型使用 ``` const a,b = 3,4 ``` ``` var c int=math.Sqrt(a*a+b*b) ``` # 特殊常量-枚舉類型 ## 普通枚舉類型 ``` const ( cpp=1 php=2 java=3 ) ``` ## 自增值枚舉類型 ``` const ( cpp1=iota php2 java3 ) const ( b=1<<(10*iota) kb mb gb tb pb ) ``` # 一個main函數搞定所有 ``` package main import "fmt" func main() { var v_name_int int = 1 var v_name = 2 v_name_ := 3 var ( v1_string string = "this is v1" v2 bool = true v3_min int = -9223372036854775808 v3_max int = 9223372036854775807 v4_uint8_min uint8 = 0 v4_uint8_max uint8 = 255 v4_uint16_min uint16 = 0 v4_uint16_max uint16 = 65535 v4_uint32_min uint32 = 0 v4_uint32_max uint32 = 4294967295 v4_uint64_min uint64 = 0 v4_uint64_max uint64 = 18446744073709551615 v4_int8_min int8 = -128 v4_int8_max int8 = 127 v4_int16_min int16 = -32768 v4_int16_max int16 = 32767 v4_int32_min int32 = -2147483648 v4_int32_max int32 = 2147483647 v4_int64_min int64 = -9223372036854775808 v4_int64_max int64 = 9223372036854775807 v5 byte = 'a' v6_float32 float32 = 2.2 v6_float64 float64 = 2.2 //定義指針*運算符不僅能取值,還可以對指向變量值 p *int p1 = 12 //通過&運算符可以獲取指針所指向地址的值 p_addres = &p1 //通過*運算符可以獲取變量地址的原始數據,叫解引用 p_value = *p_addres ) const c1 = "this is const" } ```
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