solidity智能合约[28]-函数返回值

function  resValue() pure public returns(uint){
    uint a = 10;
    return a;
}

function  recieveValue() pure public returns(uint){
    uint b;
    b = resValue();
    return b;
}

//1、直接赋值、不需要return返回
function resValue2() pure public returns(uint num1){
    num1 = 100;
}
//2、如果有return，以return为准
function resValue3() pure public returns(uint num1){
  num1 = 100;
  return 99;
}
//3、不return，也不赋值，那么为0
function resValue4() pure public returns(uint num1){
  uint b = 88;
}

function mulvalue(uint a,uint b) pure public returns(uint,uint){
  uint add =  a+b;
  uint mul = a*b;
  return (add,mul);
}
//命名返回值+多返回值
 function mulvalue2(uint a,uint b) pure public returns(uint add,uint mul){
   add =  a+b;
   mul = a*b;
}

function reverse(uint a,uint b) returns(uint ,uint){
    return (b,a);
}

    uint public  resA = 0;
    uint public resB = 0;

  function reverse2(uint a,uint b) {
    (resA,resB) = reverse(a,b);
}