BFS IN C

 #include <stdio.h>

 

int n, i, j, visited[10], queue[10], front = -1, rear = -1;

int adj[10][10];

 

void bfs(int v)

{

    for (i = 1; i <= n; i++)

        if (adj[v][i] && !visited[i])

            queue[++rear] = i;

    if (front <= rear)

    {

        visited[queue[front]] = 1;

        bfs(queue[front++]);

    }

}

 

void main()

{

    int v;

    printf("Enter the number of vertices: ");

    scanf("%d", &n);

    for (i = 1; i <= n; i++)

    {

        queue[i] = 0;

        visited[i] = 0;

    }

    printf("Enter graph data in matrix form:    \n");

    for (i = 1; i <= n; i++)

        for (j = 1; j <= n; j++)

            scanf("%d", &adj[i][j]);

    printf("Enter the starting vertex: ");

    scanf("%d", &v);

    bfs(v);

    printf("The node which are reachable are:    \n");

    for (i = 1; i <= n; i++)

        if (visited[i])

            printf("%d\t", i);

        else

            printf("BFS is not possible. Not all nodes are reachable");

    

}