solidity智能合约[20]-动态二维数组

动态二维数组定义

uint[][] public grade = [[60,80],[40,20],[50,50]];

获取长度

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function getLength() view public returns(uint){     return grade.length; }   function getLength2() view public returns(uint){     return grade[0].length; }

修改长度

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function changeLength() public{      grade.length = 4;  }   function changeLength2() public{      grade.length =2;  }    function changeLength3() public{     grade[0].length =3;  }     function changeLength4() public{     grade[0].length =1;  }

添加修改内容

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function changeContent() public{     grade[1][0] = 100; } function changeContent2() public{    grade.push([100,90]); }

遍历内容

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//获取内容并求和 function   add() view public returns(uint){    uint sum = 0;    for(uint i = 0;i<3;i++){        for(uint j = 0;j<2;j++){             sum+= grade[i][j];        }    }    return sum; }

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