C++/Data Structure/Array Two Dimension

Create a two-dimensional array of objects.

<source lang="cpp">

1. include <iostream>

using namespace std; class MyClass {

 int a;

public:

 MyClass(int n) { 
    a = n; 
 }
 int getA() { 
    return a; 
 }

}; int main() {

 MyClass ob[4][2] = {
   1, 2,
   3, 4,
   5, 6,
   7, 8
 };
 int i;
 
 for(i = 0; i <4; i++) {
   cout << ob[ i ][0].getA() << " ";
   cout << ob[ i ][1].getA() << endl;
 }
 cout << endl;
 return 0;

}

      </source>

Define and initiate a two-dimensional array

<source lang="cpp">

1. include <iostream>
2. include <iomanip>

using namespace std; int matrix[3][5] = { { 215, 314, 216, 112, 8 },

                    { 119, 217, 214, 111,  4 },
                    {  61, 115, 315, 316, 118 } };

int rowsum[3]; int colsum[5];

int matrixsum( int arr2D[][5], int vlen, int rsum[], int csum[]); int main() {

  cout << "Testing the function matrixsum()." << endl;
  int totalsum = matrixsum( matrix, 3, rowsum, colsum);
  cout << "The matrix with the sums of rows and columns:" << endl;
  int i,j;
  for( i = 0 ; i < 3 ; ++i)    
  {                            // matrix with row sums.
    for( j = 0 ; j < 5 ; ++j)
      cout << setw(8) << matrix[i][j];
    cout << " | " << setw(8) << rowsum[i] << endl;
  }
  cout << endl;
  for( j = 0 ;  j < 5  ;  ++j )
    cout << setw(8) << colsum[j];
  cout << " | " << setw(8) << totalsum << endl;
  return 0;

} int matrixsum( int v[][5], int len, int rsum[], int csum[]) {

  int ro, co;                      // Row and column index
  
  for( ro = 0 ; ro < len ; ++ro)    // To compute row sums
  {
     rsum[ro] = 0;
     for( co = 0 ; co < 5 ; ++co)
       rsum[ro] += v[ro][co];
  }
  for(co = 0 ; co < 5 ; ++co)       // Compute column sums
  {
     csum[co] = 0;
     for( ro = 0 ; ro < len ; ++ro)
       csum[co] += v[ro][co];
  }
  return (rsum[0] + rsum[1] + rsum[2]);  // Total sum =

} // sum of row sums.

      </source>

Init two dimension class array

<source lang="cpp">

1. include <iostream>

using namespace std; class MyClass {

 int a, b;

public:

 MyClass(int n, int m) { 
    a = n; 
    b = m; 
 }
 int getA() { 
    return a; 
 }
 int getB() { 
 
    return b; 
 }

}; int main() {

 MyClass ob[4][2] = {
   MyClass(1, 2), MyClass(3, 4), 
   MyClass(5, 6), MyClass(7, 8),
   MyClass(9, 10), MyClass(11, 12),
   MyClass(13, 14), MyClass(15, 16)
 };
 int i;
 for(i = 0; i <4; i++) {
   cout << ob[ i ][0].getA() << " ";
   cout << ob[ i ][0].getB() << endl;
   cout << ob[ i ][1].getA() << " ";
   cout << ob[ i ][1].getB() << endl;
 }
 cout << endl;
 return 0;

}

      </source>

Multidimensional Arrays

<source lang="cpp">

1. include <iostream>
2. include <iomanip>

using namespace std; char representative[2][20] = {"AAAAAAAAAAAA",

                             "BBBBBBBBBBBB"};

int articleCount[2][5] = { { 120, 151, 130, 117, 144},

                           {150, 120, 190, 110, 188}
                         };

int main(){

  for( int i=0; i < 2; i++ ){
     cout <<"\nRepresentative:  " << representative[i];
     cout << "\nNumber of items sold: ";
     for( int j = 0; j < 5; j++ )
        cout << setw(6) << articleCount[i][j];
     cout << endl;
  }
   return 0;

}

      </source>