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2d array declaration in c++

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isuro answered on May 27, 2021 Popularity 9/10 Helpfulness 2/10

answer 2d array declaration in c++

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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

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Tags: 2d c++ declaration

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Contributed on Feb 07 2023

isuro

0 Answers Avg Quality 2/10

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2d array c++

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int a[2][3]= {
        {1, 2, 3},
        {4, 5, 6}
    };
    
    cout << a[1][1]; // Output is 5

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: 2d 2

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Contributed on May 27 2021

Kumaran KM

0 Answers Avg Quality 2/10

2-Dimensional array in c++

Comments(1)

int row,col;
cout << "please input how many rows and columns you want accordingly: ";
cin>>row>>col;
//create array in heap.
int **arr=new int*[row];
for(int i=0;i<row;i++)
{
    arr[i]=new int[col];
}
//getting value from user.
for(int i=0;i<row;i++)
{
    for(int j=0;j<col;j++)
    {
        cout<<"Enter a number ";
        cin>>arr[i][j];
    }
}
//display Elements.
    for(int i=0;i<row;i++)
{
    for(int j=0;j<col;j++)
    {
        cout<<arr[i][j]<<" ";
    }
}

return 0;

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: stackoverflow.com

Tags: c++

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Contributed on Dec 12 2021

coder

0 Answers Avg Quality 2/10

2d array c++

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-1

//* 2D arrays
int n, m;
cout << "Enter row and column: ";
cin >> n >> m;
int arr[n][m];
for (int i = 0; i < n; i++)
{
  for (int j = 0; j < m; j++)
  {
    cin >> arr[i][j];
  }
}

cout << "\nShowing array\n";

for (int i = 0; i < n; i++)
{
  for (int j = 0; j < m; j++)
  {
    cout << arr[i][j] << " ";
  }
  cout << endl;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: 2d 2

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Contributed on Sep 11 2022

Subodh Chandra Shil

0 Answers Avg Quality 2/10

2d array declaration in c++

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