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pragma solidity ^0.4.23;
contract twoArray{
// uint[2] jonsongrade = [60,80];
uint[2] ericGrade = [40,20];
// uint[2] stevenGrade = [50,50];
uint[2][3] grade = [[60,80],[40,20],[50,50]];
function getGrade() view public returns(uint[2][3]){
return grade;
}
function getLength() view public returns(uint){
return grade.length;
}
function getLength3() view public returns(uint){
return grade[0].length;
}
// function changelength() public {
// grade[0].length =10;
// }
function changeContent() public {
grade[0][1] = 100;
// grade.push(ericGrade);
// grade[0][2]=90;
}
//获取内容并求和
function add() view public returns(uint){
uint sum = 0;
//定义的时候和获取数据的时候有些差别，在获取数据的时候，第一个数字i代表的是i+1元素，第二个数据j代表的是i+1个元素内的第j+1个内容
//1、 i = 0 i<3
//2、j=0 j <2
//3、sum += grade[0][0];、sum += 60;
//4、j++---->j=1;
//5.j<2?
//6.sum+=grade[0][1];sum += 80
//7.j++------j=2;
//8.j<2
//9.i++ --->i=1;
//10.i<3
//11.j = 0
//12.j<2?
//13.sum += grade[1][0]
//14.j++
//15.........
//最后遍历了grade[0][0]，grade[0][1]，grade[1][0]，grade[1][1]，grade[2][0]，grade[2][1]
for(uint i = 0;i<3;i++){
for(uint j = 0;j<2;j++){
sum+= grade[i][j];
}
}
return sum;
}
}
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