数据结构：线性结构（多维数组）的定义

#include <iostream>
typedef int a1[3];//p98 a[2][3]
typedef a1 a2[2];
int main() {
    a2 a={9,9,9,0,0,0};//二维数组，二行三列
    for (int i = 0; i < 2; ++i) {
        for (int j = 0; j < 3; ++j) {
            std::cout<<a[i][j]<<" ";
        }
        std::cout<<"\n";
    }
   
    return 0;
}