passing an 2d array in cpp

Nikikinz

Code: C++

2021-04-15 15:09:49

// The following program works only if your compiler is C99 compatible. 
#include <stdio.h> 
  
// n must be passed before the 2D array **important 
void print(int m, int n, int arr[][n]) 
{ 
    int i, j; 
    for (i = 0; i < m; i++) 
      for (j = 0; j < n; j++) 
        printf("%d ", arr[i][j]); 
} 
  
int main() 
{ 
    int arr[][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; 
    int m = 3, n = 3; 
    print(m, n, arr); 
    return 0; 
}

Vaidik

Code: C++

2021-02-08 20:59:54

#include <iostream>
#include <vector>
using namespace std;

typedef vector< vector<int> > Matrix;

void print(Matrix& m)
{
   int M=m.size();
   int N=m[0].size();
   for(int i=0; i<M; i++) {
      for(int j=0; j<N; j++)
         cout << m[i][j] << " ";
      cout << endl;
   }
   cout << endl;
}


int main()
{
    Matrix m = { {1,2,3,4},
                 {5,6,7,8},
                 {9,1,2,3} };
    print(m);

    //To initialize a 3 x 4 matrix with 0:
    Matrix n( 3,vector<int>(4,0));
    print(n);
    return 0;
}

Mqwerty2

Code: C++

2021-04-02 00:09:18

Pass a pointer to a pointer

void processArr(int **a) {
   // Do Something
}
// When calling:
int **array;
array = new int *[10];
for(int i = 0; i <10; i++)
   array[i] = new int[10];
processArr(array);

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