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declaring 2d dynamic array c++

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Apalov answered on April 4, 2020 Popularity 10/10 Helpfulness 4/10

answer declaring 2d dynamic array c++

related how to make a n*n 2d dynamic array in c++

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declaring 2d dynamic array c++

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int** arr = new int*[10]; // Number of Students
int i=0, j;
for (i; i<10; i++) 
	arr[i] = new int[5]; // Number of Courses
/*In line[1], you're creating an array which can store the addresses
  of 10 arrays. In line[4], you're allocating memories for the 
  array addresses you've stored in the array 'arr'. So it comes out 
  to be a 10 x 5 array. */

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: 2d c++ dynamic

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Contributed on Sep 18 2020

Apalov

0 Answers Avg Quality 2/10

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how to make a n*n 2d dynamic array in c++

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int** a = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
    a[i] = new int[colCount];

Popularity 10/10 Helpfulness 6/10 Language cpp

Source: stackoverflow.com

Tags: 2d 2

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Contributed on Apr 04 2020

Plain Partridge

0 Answers Avg Quality 2/10

2d array declaration in c++

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/*
Type of 2D Array Declaration
Type-1 : General Way
Type-2 : Using Single Pointer
Type-3 : Using Double Pointer
The program will take user input for each type and will print the 2d array
*/

#include<iostream>
using namespace std;

//Method 1- General Way
void Simple2DArray(int row, int col){
    int arr[row][col];
    for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << "Enter element of row " << (i+1) << " column " << (j+1) << " : " << endl;
            cin >> arr[i][j];
        }
    }
   for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
}

//Method 2- Using single pointer
void SinglePointer2DArray(int row, int col){
    int *arr[row];
    
    for(int i=0; i<row; i++){
         arr[i] = new int[col];
    }
   
    for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << "Enter element of row " << (i+1) << " column " << (j+1) << " : " << endl;
            cin >> arr[i][j];
        }
    }
    for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
}

//Method 1- Using double Pointer
void DoublePointer2DArray(int row, int col){
    int **arr;
    arr = new int *[row];
     for(int i=0; i<row; i++){
         arr[i] = new int[col];
    }
    for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << "Enter element of row " << (i+1) << " column " << (j+1) << " : " << endl;
            cin >> arr[i][j];
        }
    }
    for(int i=0; i<row; i++){
        for(int j=0; j<col; j++){
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }
}

int main(){
    int row, col;
    cout << "Enter Number Of Rows: ";
    cin >> row;
    cout << endl << "Enter Number Of Columns: ";
    cin >> col;
    
    DoublePointer2DArray(row,col);
    
    return 0;
}

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: 2d c++

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Contributed on Feb 07 2023

isuro

0 Answers Avg Quality 2/10

two dimensional dynamic array c++

Comment

-1

int ** two_dim_array(int row_num, int col_num)
{
	int **two_dim_array=(int **)malloc(sizeof(int *)*row_num);
    int i, j;
  	for(i=0:i<row_num;i++)
    {
  		two_dim_array[i]=(int *)malloc(sizeof(int)*col_num);
      	for(j=0:j<col_num;j++)
          	two_dim_array[i][j]=0;
    }
  	return two_dim_array;
}

Popularity 9/10 Helpfulness 1/10 Language c

Source: Grepper

Tags: 2d 2

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Contributed on Apr 25 2022

LAZAROS ALEXANDRIDIS

0 Answers Avg Quality 2/10

declaring 2d dynamic array c++

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2d array declaration in c++

two dimensional dynamic array c++

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