求解释scores[i][j];在这个代码的的意义及作用

Question

#include <iostream>
using namespace std;
int main() 
{
    string stu_names[]{ "刘备", "关羽", "张飞" };
    string course_names[]{ "语文", "数学", "英语" };
    const int ROW = 3;//三行
    const int COL = 3;//三列
    double scores[ROW][COL];
    for(int i = 0; i<ROW; i++)//控制列
        for (int j = 0; j < COL; j++)//控制行
        {
            cout << stu_names[i] << "的" << course_names[j] << "成绩";
            cin >> scores[i][j];
        }
    cout << '\t';
    for (int i = 0; i < COL; i++)
    {
        cout << course_names[i] << '\t';
    }
    cout << endl;
    for (int i = 0; i < ROW; i++)
    {    cout << stu_names[i] << '\t';
    
        for (int j = 0; j < COL; j++) {
            cout << scores[i][j] << '\t';
        }


        cout << endl;
    }



}

Answer 1

要理解双重for循环的执行顺序，外层for的i＝0时，内层for的j会分别等于0，1，2。然后外层for的i才会变成1，接着内层for的j，又经历0，1，2....