Scribd
Upload
23 views2 pages

Lab 11

The document provides a C program to perform operations on a graph representing cities using an adjacency matrix. It includes functions for breadth-first search (BFS) and depth-first search (DFS) to find all reachable nodes from a given starting node. The program allows the user to input the number of vertices and the graph data, and then choose between BFS and DFS to explore the graph.

Uploaded by

Ramesh sunadholi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
23 views2 pages

Lab 11

The document provides a C program to perform operations on a graph representing cities using an adjacency matrix. It includes functions for breadth-first search (BFS) and depth-first search (DFS) to find all reachable nodes from a given starting node. The program allows the user to input the number of vertices and the graph data, and then choose between BFS and DFS to explore the graph.

Uploaded by

Ramesh sunadholi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

11.

Develop a Program in C for the following operations on Graph(G) of Cities


a. Create a Graph of N cities using Adjacency Matrix.
b. Print all the nodes reachable from a given starting node in a digraph using DFS/BFS
method
#include <stdio.h>
#include <stdlib.h>
int a[20][20],q[20],visited[20],reach[10],n,i,j,f=0,r=-1,count=0;
void bfs(int v)
{
for(i=1;i<=n;i++)
if(a[v][i] && !visited[i])
q[++r]=i;
if(f<=r)
{
visited[q[f]]=1;
bfs(q[f++]);
}
}
void dfs(int v)
{
int i; reach[v]=1;
for(i=1;i<=n;i++)
{
if(a[v][i] && !reach[i])
{
printf("\n %d->%d",v,i);
count++;
dfs(i);
}
}
}
void main()
{
int v, choice;
printf("\n Enter the number of vertices:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
q[i]=0;
visited[i]=0;
}
for(i=1;i<=n-1;i++)
reach[i]=0;
printf("\n Enter graph data in matrix form:\n");
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
scanf("%d",&a[i][j]);
printf("1.BFS\n 2.DFS\n 3.Exit\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
printf("\n Enter the starting vertex:");
scanf("%d",&v);
bfs(v);
if((v<1)||(v>n))
{
printf("\n Bfs is not possible");
}
else
{
printf("\n The nodes which are reachable from %d:\n",v);
for(i=1;i<=n;i++)
if(visited[i])
printf("%d\t",i);
}
break;
case 2:
dfs(1);
if(count==n-1)
printf("\n Graph is connected");
else
printf("\n Graph is not connected");
break;

case 3: exit(0);
}
}

You might also like