solidity智能合约[17]-动态长度数组

动态长度数组

动态长度数组可以改变大小和长度

动态长度数组的定义

uint[] grade=[1,2,3,4,5];

返回动态长度数组

function getArray() public view returns(uint[]){
      return grade;
  }

获取动态数组长度

function getlength() public view returns(uint){
    return grade.length;
}

遍历动态长度数组

function cheng() public view returns(uint){

    uint result  = 1;
    for(uint i = 0;i<grade.length;i++){
        result  *= grade[i]; //  result  = result * grade[i]
    }
    return result;
}

改变动态数组长度

//截断
function changeLength() public {
    grade.length = 3;
}

   function changeLength2() public {
    grade.length = 5;
}

 function pushelement() public {
    grade.push(99);
}