how to initialise 2d array code example

Example 1: initializing 2d vector

vector<vector<int> > vec( n , vector<int> (m, 0));

Example 2: c fill 2d array

// Either
int disp[2][4] = {
  {10, 11, 12, 13},
  {14, 15, 16, 17}
};

// Or 
int disp[2][4] = { 10, 11, 12, 13, 14, 15, 16, 17};

// OR
int i, j;
for (i = 0; i < HEIGHT; i++) { // iterate through rows
  for (j = 0; j < WIDTH; j++) { // iterate through columns
    disp[i][j] = disp[i][j];
  }
}

Example 3: accessing elements 2D array using pointers

#include<stdio.h>
//accessing elements of 2D array using pointers
int main(void){

    int arr[4][4]={{1,2,3,4},{5,6,7,8},{9,0,1,2}};
    int *ptr = &arr;

    //accessing the elements of 2D array using ptr
    for(int i=0;i<3;i++){
            for(int j=0;j<4;j++)
            printf("%d ",*((ptr+i*4)+j)); //4 is the number of columns
            //*((ptr+i*4)+j) is similar to arr[i][j]
            printf("\n");
    }
    return 0;
}

Example 4: two dimensional array in java example program

String[][][] data = new String[3][4][2];

Example 5: Java 2d array initialization

class TwoDimensionalArray {

    public static void main(String[] args) {
        String[][] salutation = {
            {"Mr. ", "Mrs. ", "Ms. "},
            {"Kumar"}
        };

        // Mr. Kumar
        System.out.println(salutation[0][0] + salutation[1][0]);

        // Mrs. Kumar
        System.out.println(salutation[0][1] + salutation[1][0]);
    }
}

The output from this program is:

Mr. Kumar
Mrs. Kumar

Example 6: initialize 2d array c++

#include <array>
2 #include <iostream>
3
4 using namespace std;
5
6 //remember const!
7 const int ROWS = 2;
8 const int COLS = 3;


int main(){
 array<array<int, COLS>, ROWS> matrix = {
 1, 2, 3,
 4, 5, 6
 };
  
  
  return 0;
}