如何使用随机数打印二维数组

Question

I am trying to write a program that prints a 2d array with random numbers ranging from 100-10000 and prints out the max number in the array,average,and min. The program will ask the user for the number of rows and column and print random numbers in that array.

Here is my code:

Random rand = new Random();

int randomnumber = rand.nextInt(9901) + 100;

Scanner console = new Scanner(System.in);

System.out.println("Enter row");
int n = console.nextInt();

System.out.println("Enter column");
int y = console.nextInt();

int[][] array = new int[n][y];
array[n][y] = randomnumber;

int k;
for (int i = 0; i <= array.length; i++) {
    for (k = 0; k <= array[i].length; k++) {
        System.out.print(array[i][k]);
    }
}

Answer 1

If you want to fill the array with random values, you need to generate random values in a loop, and then write them to the array in that loop. So far you are only generating one value (and putting it in an invalid location).

Additionally, since arrays are 0-based, your loops should be for(i=0; i<arr.length; i++); , not <= .

Here's some code:

// don't declare k here
for(int i=0;i<array.length;i++){

 for(int k=0;k<array[i].length;k++){
      array[i][k]=rand.nextInt(9901)+100;
      System.out.print(array[i][k]);


 }
 System.out.println(); // separate rows
}