2020.8.18第四十三天

例5.4二维数组

public class cjava {
    public static void main(String[] args) {
        int i,j;
        int[][] a={{1,2,3},{4,5,6}};
        int[][] b=new int[3][2];
        System.out.println("array a:");
        for(i=0;i<=1;i++)
        {
        for(j=0;j<=2;j++)
        {
         System.out.print(a[i][j]+" ");
         b[j][i]=a[i][j];
         }
        System.out.println();
        }
        System.out.println("array b: ");
        for(i=0;i<=2;i++)
        {
            for(j=0;j<=1;j++)
            {
            System.out.print(b[i][j]+" ");
        }
            System.out.println();    
    }
    }
}

 例5.5 3*4矩阵求最大值

public class cjava {
    public static void main(String[] args) {
        int[][] a= {{11,32,45,67},{22,44,66,88},{15,72,43,37}};
        System.out.println("max value is:"+max_value(a));
    }
    static int max_value(int array[][])
    {
        int i,j,max;
        max=array[0][0];
        for(i=0;i<3;i++)
        {
            for(j=0;j<4;j++)
            {
                if(array[i][j]>max) max=array[i][j];
            }
        }
        return max;
    }
}

 例5.6  输出钻石

public class cjava {
    public static void main(String[] args) {
        char [][] a= {{' ',' ','*'},{' ','*',' ','*'},{'*',' ',' ',' ','*'},{' ','*',' ','*'},{' ',' ','*'}};
        int i,j;
        for(i=0;i<a.length;i++)
        {
            for(j=0;j<a.length;j++)
            {
                System.out.print(a[i][j]);
            }
            System.out.println();
    }
    }
}

2.遇到的问题：不知道为什么最后一个在用i<5会提示越界

3.明天继续例题