Description

* In two dimensional array first subscript denotes row, second denotes column.
* Two dimensional array is an array of one dimensional arrays.
* In 2D array, size of first dimension can be omitted.
  example: int price[][3] = {{45,26,34},{48,65,97}};
* To initialize the entire 2D array to zeros, specify the first value as zero.
  example: int price[1][2]={0};
* 2D array is stored in contiguous memory location.

C/C++

/* C program to Read and Display 2D Array */
//Save it as ReadDisplay2DArray.c

#include<stdio.h>
int main(){

    int i, j, m, n;

    printf("Enter the number of rows of array : ");
    scanf("%d",&m);

    printf("Enter the number of columns of array : ");
    scanf("%d",&n);

    //Declaring 2D array
    int arr[m][n];

    //Reading input
    for(i=0;i<m;i++) {
        for(j=0;j<n;j++) {
            printf("arr[%d][%d] : ",i,j);
            scanf("%d",&arr[i][j]);
        }
    }

    //Displaying Output
    printf("The entered array : \n");
    for(i=0;i<m;i++) {
        for(j=0;j<n;j++) {
            printf("%d ",arr[i][j]);
        }
        printf("\n");
    }
}

Input:
Enter the number of rows of array : 
3
Enter the number of columns of array : 
3
arr[0][0] : 
9
arr[0][1] : 
8
arr[0][2] : 
7
arr[1][0] : 
6
arr[1][1] : 
5
arr[1][2] : 
4
arr[2][0] : 
3
arr[2][1] : 
2
arr[2][2] : 
1

Output:
The entered array : 
9 8 7 
6 5 4 
3 2 1

Java

/* Java program to Read and Display 2D Array */
//Save it as ReadDisplay2DArray.java

import java.io.*;
import java.util.Scanner;

public class ReadDisplay2DArray {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        
        int i, j, m, n;
        
        System.out.println("Enter the number of rows of array : ");
        m = scanner.nextInt();
        
        System.out.println("Enter the number of columns of array : ");
        n = scanner.nextInt();
        
        //Declaring 2D array
        int arr[][] = new int[m][n];
        
        //Reading input
        for(i=0;i<m;i++) {
            for(j=0;j<n;j++) {
                System.out.println("arr["+i+"]"+"["+j+"] : ");
                arr[i][j] = scanner.nextInt();
            }
        }
        
        //Displaying Output
        System.out.println("The entered array : ");
        for(i=0;i<m;i++) {
            for(j=0;j<n;j++) {
                System.out.print(arr[i][j]+ " ");
            }
            System.out.println();
        }
    }
}

Input:
Enter the number of rows of array : 
3
Enter the number of columns of array : 
3
arr[0][0] : 
9
arr[0][1] : 
8
arr[0][2] : 
7
arr[1][0] : 
6
arr[1][1] : 
5
arr[1][2] : 
4
arr[2][0] : 
3
arr[2][1] : 
2
arr[2][2] : 
1

Output:
The entered array : 
9 8 7 
6 5 4 
3 2 1

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