Adjacency Matrix in C++

This C++ Program demonstrates the implementation of Adjacency Matrix.

Here is source code of the C++ Program to demonstrate the implementation of Adjacency Matrix. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Implement Adjacency Matrix

```
 */
```
```
#include <iostream>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
#define MAX 20
```
```
/*
```
```
 * Adjacency Matrix Class
```
```
 */
```
```
class AdjacencyMatrix
```
```
{
```
```
    private:
```
```
        int n;
```
```
        int **adj;
```
```
        bool *visited;
```
```
    public:
```
```
        AdjacencyMatrix(int n)
```
```
        {
```
```
            this->n = n;
```
```
            visited = new bool [n];
```
```
            adj = new int* [n];
```
```
            for (int i = 0; i < n; i++)
```
```
            {
```
```
                adj[i] = new int [n];
```

                for(int j = 0; j < n; j++)

```
                {
```
```
                    adj[i][j] = 0;
```
```
                }
```
```
            }
```
```
        }
```
```
        /*
```
```
         * Adding Edge to Graph
```
```
         */ 
```

        void add_edge(int origin, int destin)

```
        {
```

            if( origin > n || destin > n || origin < 0 || destin < 0)

```
            {   
```

                cout<<"Invalid edge!\n";

```
            }
```
```
            else
```
```
            {
```

                adj[origin - 1][destin - 1] = 1;

```
            }
```
```
        }
```
```
        /*
```
```
         * Print the graph
```
```
         */ 
```
```
        void display()
```
```
        {
```
```
            int i,j;
```
```
            for(i = 0;i < n;i++)
```
```
            {
```
```
                for(j = 0; j < n; j++)
```

                    cout<<adj[i][j]<<"  ";

```
                cout<<endl;
```
```
            }
```
```
        }
```
```
};
```
```
/*
```
```
 * Main
```
```
 */ 
```
```
int main()
```
```
{
```

    int nodes, max_edges, origin, destin;

```
    cout<<"Enter number of nodes: ";
```
```
    cin>>nodes;
```
```
    AdjacencyMatrix am(nodes);
```
```
    max_edges = nodes * (nodes - 1);
```
```
    for (int i = 0; i < max_edges; i++)
```
```
    {
```

        cout<<"Enter edge (-1 -1 to exit): ";

```
        cin>>origin>>destin;
```

        if((origin == -1) && (destin == -1))

```
            break;
```
```
        am.add_edge(origin, destin);
```
```
    }
```
```
    am.display();
```
```
    return 0;
```
```
}
```

$ g++ adjacency_matrix.cpp
$ a.out
 
Enter number of nodes: 5
Enter edge (-1 -1 to exit): 1 2
Enter edge (-1 -1 to exit): 1 4
Enter edge (-1 -1 to exit): 1 5
Enter edge (-1 -1 to exit): 2 3
Enter edge (-1 -1 to exit): 2 5
Enter edge (-1 -1 to exit): 3 1
Enter edge (-1 -1 to exit): 5 2
Enter edge (-1 -1 to exit): 4 3
Enter edge (-1 -1 to exit): -1 -1
0  1  0  1  1
0  0  1  0  1
1  0  0  0  0
0  0  1  0  0
0  1  0  0  0
 
------------------
(program exited with code: 1)
Press return to continue

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