Educoder-练习-Java数组之二维数值数组之矩阵乘

这个三重for循环是有点小牛哦……

• for循环的进阶应用
• 静态数组初始化
• 二维数组灵活控制

class Transpose{
        public static void main(String[] args){
                int[][] arr1 = {   {5,6,7},
                                {15,65,43},
                                {32,43,22},
                                {11,88,6},
                                {4,98,66}};

                int[][] arr2 = {   {94,65,31,87,21},
                                {48,2,0,71,98},
                                {38,29,66,88,100}};
                
                int[][] arr3 = new int[5][5];
				
				//目的，arr3[0][0] = 5 * 94 + 6 * 48 + 7 * 38;甭说了，我自己都懵
				
                for (int i = 0 ; i < 5 ; i++){
                        for (int j = 0; j < 5; j++){
                                for (int k = 0 ; k < 3; k++){
                                        arr3[i][j] = arr3[i][j] + arr1[i][k] * arr2[k][j];
                                }
                        }
                }
                for (int i = 0; i < arr3.length; i++){
                        for (int j = 0; j < arr3[i].length; j++){
                                System.out.print( arr3[i][j]+ " ");
                        }
                        System.out.println();
                }
        }
}