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

int** a = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
    a[i] = new int[colCount];
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declaring 2d dynamic array c++

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. */
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function for 2d dynamic array

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;
}
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