this is my code i wanted to return a 2d array from a function and use it in other function inorder to modify it.

#include<bits/stdc  .h>
using namespace std;


int** createMat(int row,int col){
     int arr[row][col];

     for(int i=1;i<=row;i  ){
         for(int j=1;j<=col;j  ){
             cin>>arr[i][j];
         }
     }
return arr;
     
}

int main(){
    int row,col;
    cin>>row;
    cin>>col;

    createMat(row,col);
   

}

CodePudding user response：

You should use containers. They are the bread and butter of C .

Please follow the advice of Some programmer dude. Invest in a good C book.

#include <vector>
#include <iostream>

std::vector<std::vector<int>> createMat(int row, int col)
{
    std::vector<std::vector<int>> data;
    data.resize(row);
    for (auto& c : data)
    {
        c.resize(col);
    }

    for (int i = 0; i < row; i  ) {
        for (int j = 0; j < col; j  ) {
            std::cin >> data[i][j];
        }
    }
    return data;
}

int main() {
    int row, col;
    std::cin >> row;
    std::cin >> col;

    auto mydata = createMat(row, col);
    // do something with it
}

CodePudding user response：

Or if you don't want to use vector, you can use pointer and do it like this.

#include<bits/stdc  .h>
using namespace std;


int** createMat(int row,int col)
{
    int **arr = 0;
    arr = new int*[row];
    for (int r = 0; r < row; r  )
    {
        arr[r] = new int[col];
        for (int c = 0; c < col; c  )
        {
            cin>>arr[r][c];
        }
    }
return arr;
     
}

int main()
{
    int row,col;
    cin>>row;
    cin>>col;

    int** createdMat = createMat(row,col);

    cout << "print Array\n";
    for (int r = 0; r < row; r  )
    {
        for (int c = 0; c < col; c  )
        {
                printf("%i ", createdMat[r][c]);
        }
        printf("\n");
    }
}