pragma solidity ^0.4.0;

contract modifierTest{

    uint public v1;

    uint constant v2 =10;

    //uint constant v3; Uninitialized "constant" variable

    string public v4='test1';

    string constant v5='test2';

    //string constant v6;Uninitialized "constant" variable

    function f() public{

        v1 = 10;

        //v2 = 20;Cannot assign to a constant variable

        v4 = 'vtesst';

        //v5 = 'vtest2';Cannot assign to a constant variable

    }

    struct test{

        string name;

        uint _sex;

    }

    //test constant test1; constant 仅可以修饰值类型,无法修饰引用类型(string除外)

    function set() constant public{ //被修饰的函数内,状态变量无法被改变

        v1 =100;

    }

    //告诉编译器，函数不改变/不读取状态变量，这样函数执行就可以不消耗gas了，因为不需要矿工来验证

    // 1.view 仅可以修饰函数

    // 2.在该函数内,仅可以对storage类型的变量进行读取,无法修改

    address owner;

    function setview(address add) view public {

        owner =  add;

    }

    function getadd()returns(address){

        return owner;

    }

    // 1.pure 仅可以修饰函数

    // 2.在函数内,无法读写状态变量--

}