c++ : "no matching function for call to" error with function -

i have function "mod_kadane" defined in class "max_sub_mat" returns object.

#define dx 101 class max_sub_mat {   public: int curr_sum, max_sum, left, right, up, down;  max_sub_mat mod_kadane(int mat[dx][dx], int row, int column) {     max_sub_mat objx;     curr_sum = objx.max_sum = int_min;     int sub_mat[row];      for(int l = 0; l < row; l++)     {         memset(sub_mat, 0, sizeof sub_mat);         for(int r = l; r < column; r++)         {             for(int = 0; < row; i++)             {                 sub_mat[i] += i;//mat[i][r];             }              max_sub_arr obj;             obj = obj.kadane(sub_mat, row);             curr_sum = obj.maxima;              if(curr_sum > objx.max_sum)             {                 objx.max_sum = curr_sum;                  objx.left = l;                 objx.right = r;                 objx.up = obj.left;                 objx.down = obj.right;             }         }     }     return objx; } }; 

but when i'm trying call "main":

cin >> row >> column; int mat[row][column]; for(int = 0; < row; i++)     {         for(int j = 0; j < column; j++)         {             cin >> mat[i][j];         }     }  max_sub_mat objx; objx = objx.mod_kadane(mat, row, column); 

then error shown:

error: no matching function call 'max_sub_mat::mod_kadane(int [row][column], int&, int&)'|

but if remove 2d array "mat" both sides code works fine.

here full code:

#include<bits/stdc++.h>  #define dx 101  using namespace std;  class max_sub_arr { public: int max_curr, maxima, left, right;   max_sub_arr kadane(int arr[], int n) {     max_sub_arr obj;      obj.maxima = max_curr = int_min;     //cout << obj.maxima << endl;     /*for(int = 0; < n; i++)         cout << arr[i] << endl;*/     for(int = 0; < n; i++)     {         if(max_curr < 0)         {             max_curr = arr[i];             obj.left = i;         }         else         {             max_curr += arr[i];         }          //maxima = max(maxima, max_curr);         if(max_curr > obj.maxima)         {             obj.maxima = max_curr;             obj.right = i;             //cout << obj.maxima << endl;         }     }      return obj; } };  class max_sub_mat {   public: int curr_sum, max_sum, left, right, up, down; /* max_sub_mat(int r, int c) {     row = r;     column = c; }*/  max_sub_mat mod_kadane(int mat[dx][dx], int row, int column) {     max_sub_mat objx;     curr_sum = objx.max_sum = int_min;     int sub_mat[row];      for(int l = 0; l < row; l++)     {         memset(sub_mat, 0, sizeof sub_mat);         for(int r = l; r < column; r++)         {             for(int = 0; < row; i++)             {                 sub_mat[i] += i;//mat[i][r];             }              max_sub_arr obj;             obj = obj.kadane(sub_mat, row);             curr_sum = obj.maxima;              if(curr_sum > objx.max_sum)             {                 objx.max_sum = curr_sum;                  objx.left = l;                 objx.right = r;                 objx.up = obj.left;                 objx.down = obj.right;             }         }     }     return objx; } };   int main() {  int row, column;  printf("number of rows want insert?:\n"); cin >> row;  printf("number of columns want insert?:\n"); cin >> column;  int mat[row][column];  if(row && column) {     for(int = 0; < row; i++)     {         for(int j = 0; j < column; j++)         {             cin >> mat[i][j];         }     }      //int curr_sum, max_sum, left, right, up, down;       //max_sub_mat objx = new max_sub_mat(row, column);     max_sub_mat objx;     objx = objx.mod_kadane(mat, row, column);      for(int = objx.up; <= objx.down; i++)     {         for(int j = objx.left; j <= objx.right; j++)         {             cout << mat[i][j] << " ";         }          cout << endl;     } }  return 0; } 

it not true in c or c++ cannot declare function 2 dimensional array parameter both sizes specified.

see: http://c-faq.com/aryptr/pass2dary.html

the problem has been correctly explained @alanstokes in comments!