Borland

The new and delete Operators with multi-dimensional arrays (다차배열)

leo21c 2011. 1. 18. 15:21

// ALLOCATE A TWO-DIMENSIONAL SPACE, INITIALIZE, AND DELETE IT.

#include <exception>
#include <iostream>

using std::cout;
using std::endl;
void display(long double **);
void de_allocate(long double **);

int m = 3; // THE NUMBER OF ROWS.
int n = 5; // THE NUMBER OF COLUMNS.

int main(void) {
long double **data;

try { // TEST FOR EXCEPTIONS.
  data = new long double*[m]; // STEP 1: SET UP THE ROWS.
  for (int j = 0; j < m; j++)
    data[j] = new long double[n]; // STEP 2: SET UP THE COLUMNS
  }
  catch (std::bad_alloc) { // ENTER THIS BLOCK ONLY IF bad_alloc IS THROWN.
  // YOU COULD REQUEST OTHER ACTIONS BEFORE TERMINATING
    cout << "Could not allocate. Bye ...";
    exit(-1);
  }

  for (int i = 0; i < m; i++)
    for (int j = 0; j < n; j++)
      data[i][j] = i + j; // ARBITRARY INITIALIZATION
  
  display(data);
  de_allocate(data);
  return 0;
}

void display(long double **data) {
  for (int i = 0; i < m; i++) {
    for (int j = 0; j < n; j++)
      cout << data[i][j] << " ";
    cout << "\n" << endl;
  }
}

void de_allocate(long double **data) {
  for (int i = 0; i < m; i++)
    delete[] data[i]; // STEP 1: DELETE THE COLUMNS
  delete[] data; // STEP 2: DELETE THE ROWS
}


LIST