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📜  Solidity-类型

📅  最后修改于: 2020-11-04 04:20:43             🧑  作者: Mango

 

用任何语言编写程序时，您需要使用各种变量来存储各种信息。变量不过是用于存储值的保留内存位置。这意味着当您创建变量时，会在内存中保留一些空间。

您可能希望存储各种数据类型的信息，例如字符，宽字符，整数，浮点数，double浮点数，boolean等。操作系统根据变量的数据类型分配内存，并确定可以存储在变量中的内容。保留的内存。

值类型

Solidity为程序员提供了丰富的内置以及用户定义的数据类型。下表列出了七种基本的C++数据类型-

Type Keyword Values
Boolean bool true/false
Integer int/uint Signed and unsigned integers of varying sizes.
Integer int8 to int256 Signed int from 8 bits to 256 bits. int256 is same as int.
Integer uint8 to uint256 Unsigned int from 8 bits to 256 bits. uint256 is same as uint.
Fixed Point Numbers fixed/unfixed Signed and unsigned fixed point numbers of varying sizes.
Fixed Point Numbers fixed/unfixed Signed and unsigned fixed point numbers of varying sizes.
Fixed Point Numbers fixedMxN Signed fixed point number where M represents number of bits taken by type and N represents the decimal points. M should be divisible by 8 and goes from 8 to 256. N can be from 0 to 80. fixed is same as fixed128x18.
Fixed Point Numbers ufixedMxN Unsigned fixed point number where M represents number of bits taken by type and N represents the decimal points. M should be divisible by 8 and goes from 8 to 256. N can be from 0 to 80. ufixed is same as ufixed128x18.

地址

address保存20字节的值，代表以太坊地址的大小。一个地址可以使用.balance方法获取余额，也可以使用.transfer方法将余额转移到另一个地址。

address x = 0x212;
address myAddress = this;
if (x.balance < 10 && myAddress.balance >= 10) x.transfer(10);