use of bfs and dfs code example

Example: BFS AND DFS IN C

#include
#include
 
#define MAX 100  
 
#define initial 1
#define waiting 2
#define visited 3
 
int n;    
int adj[MAX][MAX];
int state[MAX]; 
void create_graph();
void BF_Traversal();
void BFS(int v);
 
int queue[MAX], front = -1,rear = -1;
void insert_queue(int vertex);
int delete_queue();
int isEmpty_queue();
 
int main()
{
	create_graph();
	BF_Traversal();
	return 0;
}
 
void BF_Traversal()
{
	int v;
	
	for(v=0; v rear)
		return 1;
	else
		return 0;
}
 
int delete_queue()
{
	int delete_item;
	if(front == -1 || front > rear)
	{
		printf("Queue Underflow\n");
		exit(1);
	}
	
	delete_item = queue[front];
	front = front+1;
	return delete_item;
}
 
void create_graph()
{
	int count,max_edge,origin,destin;
 
	printf("Enter number of vertices : ");
	scanf("%d",&n);
	max_edge = n*(n-1);
 
	for(count=1; count<=max_edge; count++)
	{
		printf("Enter edge %d( -1 -1 to quit ) : ",count);
		scanf("%d %d",&origin,&destin);
 
		if((origin == -1) && (destin == -1))
			break;
 
		if(origin>=n || destin>=n || origin<0 || destin<0)
		{
			printf("Invalid edge!\n");
			count--;
		}
		else
		{
			adj[origin][destin] = 1;
		}
	}
}