[区块链]基于以太坊的智能合约开发教程 Solidity 函数返回值

pragma solidity ^0.4.0;

contract funreturn{

    function returnTest()view  returns(uint){
        uint a =10;
        return a;
    }
    
    function returnTest2() returns(uint mul){
        mul =100;
    }
    
    function returnTest3() returns(uint mul){
        uint a =10;
        mul =100;
        return a;
    }
    
    function returnTest4()view returns(uint mul){
        uint a = 10;
        mul =100;
        return 1;
    }
    
    //  函数可以有多返回值
    function returnTest5(uint a,uint b) view returns(uint add,uint mul){
        add = a+b;
        mul  = a*b;
    }
    
    function returnTest6(uint a,uint b) view returns(uint add,uint mul){
        return (a+b,a*b);
    }
    
    //  交换变量的值
    function returnTest7(uint a,uint b) view returns(uint a1,uint a2){
        return (b,a);
    }
}