ethereum(以太坊)(十一)--字节数组(二)

pragma solidity ^0.4.0;
 
contract test {
    uint [5] T =[1,2,3,4,5] ;//固定长度的数组:可修改数组内值大小,不支持push,不可更改长度
 
    /*
    contract test {
    uint [] T = new uint[](5); //ParserError: Expected identifier but got 'storage'
    //全局数组,默认创建在storage中,无法创建在memory中,长度可修改
    function setlength(uint aa){
        uint [] memory a = new uint[](5);
        bytes [] memory b = new bytes[](5);
        //TypeError: Type bytes memory[] memory is not implicitly
        //convertible to expected type bytes storage ref[] storage pointer.
        //函数内创建数组,需要指定存储在memory中,a.length不可更改
        //a.length = 10; // TypeError: Expression has to be an lvalue
        a[2] = 5;
        }
    }
    */
    function setValue(uint para){
        T[0] = para;
    }
    /*
    uint [] T =[1,2,3,4,5] ; //动态长度的数组:可修改数组内值大小,支持push,可更改长度
 
    /*
    uint [] T1 = new uint[](5);
 
    constructor() public{
        for (uint i;i<T1.length;i++){
            T1[i] = i;
        }
    }
    */
    function setlenth(uint para){
        T.length = 6;
    }
 
    function addvalue(uint para){
        T.push(3);
    }
    */
 
    function setValue1(){
        T[0] = 10;
    }
    function getValue() constant returns(uint){
        return T.length;
    }
 
    function get1Value() constant returns(uint){
        return T[0];
    }
}
 
pragma solidity ^0.4.0;
 
contract test {
    //二维数组
    uint [2][3] T = [[1,2],[2,3]];
    /*
      1,2
      2,3
      0,0
    */
 
    uint [2][] T1 = new uint[2][](5);
 
    /*[i][j] T.length = j
    0,0
    0,0
    0,0
    0,0
    0,0
    */
    function getlenth() constant returns(uint){
        return T.length; //
    }
 
    function getlenth1() constant returns(uint){
        return T1.length; //
    }
 
    function get1lenth() constant returns(uint[2][]){ //输出二维数组
        return T1; //
    }
}
 
pragma solidity ^0.4.0;
 
contract test {
    function setValue() public{
 
        g([1,2,3]); //uint8
        //TypeError: Invalid type for argument in function call.
        //Invalid implicit conversion from uint8[3] memory to uint256[3] memory requeste
 
        g([uint(1),2,3]);
    }
    //uint 256
    function g(uint[3] data){
    }
 
    uint [] x1 = [uint(1),2,3];
    //storage:可变数组    memory:固定数组
    function get1() public{
        uint [] memory x = [uint(1),2,3];
        //memory:可变数组    memory:固定数组
        //在函数内部,memory类型的固定长度的数组不可直接赋值给storge/memory类型的可变数组
        //TypeError: Invalid type for argument in function call.
        //Invalid implicit conversion from uint8[3] memory to uint256[3] memory requested
    }
    function get1() public constant returns(uint[]){
        return x1; //uint256[]: 1,2,3 == [1,2,3]
        //uint [] memory x = [uint(1),2,3];
        //TypeError: Invalid type for argument in function call.
        //Invalid implicit conversion from uint8[3] memory to uint256[3] memory requested
    }
 
    pragma solidity ^0.4.0;
 
contract test {
 
    bytes3 public b = 0x123456; //bytes3: 0x123456
 
    byte[3] public b1; //b1=0x000000  可直接通过索引进行查询
 
    bytes public b2= new bytes(3); //bytes: 0x000000 == byte[] public b3 = new byte[](3)
 
    byte[] public b3 = new byte[](3); // 0x000000 可直接通过索引进行查询
 
    /*
    function setb() public{
        b[0] =0x01;
    }
    */
 
    function setb1() public{
        b1[0] =0x01;
    }
 
    function setb2(bytes aa)public {
        for (uint i;i<aa.length;i++){
            b2.push(aa[i]);
        }
    }
}
    /*
    总结:创建固定大小字节数组/可变大小字节数组
    固定大小字节数组:
      bytes0~bytes32:长度不可变,内容不可修改
      byte[len] b   :长度不可变,内容可以修改
    可变大小字节数组:可直接通过索引进行查询
      bytes b = new bytes(len) == byte[] b  = new byte[](len)
    特殊的可变字节数组:
      string :bytes() 通过bytes转换,length获取长度,通过索引修改相应的字节内容
    固定大小字节数组 -> 可变大小字节数组
      bytes3 a;
      bytes [] b = new bytes[a.length]
      for (uint i;i<a.length;i++){
          b[i] = a[i]
      }
      return b;
 
    uint [5] T =[1,2,3,4,5] ;//固定长度的数组:可修改数组内值大小,不支持push,不可更改长度
    uint [] T =[1,2,3,4,5] ; //动态长度的数组:可修改数组内值大小,支持push,可更改长度
 
    uint [] T = new uint[](5); //ParserError: Expected identifier but got 'storage'
    //全局数组,默认创建在storage中,无法指定在memory中,长度可修改
 
    //函数内创建数组,需要指定存储在memory中,a.length不可更改
 
    uint [] x1 = [uint(1),2,3] //[uint(1),2,3] = [1,2,3];
    //storage:可变数组    memory:固定数组
    */
}