Graph Traversal,DFS and BFS - Data Structures Source Code in C++

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Home » C++ Home » Data Structures Home » Graph Traversal,DFS and BFS

A D V E R T I S E M E N T

Title	Graph Traversal,DFS and BFS
Author	Arun Vishnu
Author Email	arun_vishnu [at] hotmail.com
Description	Program to create a graph and use Deapth First Search(DFS) and Breadth First Search(BFS) Traversal.
Category	C++ » Data Structures
Hits	447380
Code	Select and Copy the Code
#include<conio.h> #include<iostream.h> #include<stdlib.h> void create(); // For creating a graph void dfs(); // For Deapth First Search(DFS) Traversal. void bfs(); // For Breadth First Search(BFS) Traversal. struct node // Structure for elements in the graph { int data,status; struct node next; struct link adj; }; struct link // Structure for adjacency list { struct node next; struct link adj; }; struct node start,p,q; struct link l,*k; int main() { int choice; clrscr(); create(); while(1) { cout<<" -----------------------"; cout<<" 1: DFS 2: BSF 3: Exit Enter your choice: "; cin>>choice; switch(choice) { case 1: dfs(); break; case 2: bfs(); break; case 3: exit(0); break; default: cout<<" Incorrect choice! Re-enter your choice."; getch(); } } return 0; } void create() // Creating a graph { int dat,flag=0; start=NULL; cout<<" Enter the nodes in the graph(0 to end): "; while(1) { cin>>dat; if(dat==0) break; p=new node; p->data=dat; p->status=0; p->next=NULL; p->adj=NULL; if(flag==0) { start=p; q=p; flag++; } else { q->next=p; q=p; } } p=start; while(p!=NULL) { cout<<"Enter the links to "<<p->data<<" (0 to end) : "; flag=0; while(1) { cin>>dat; if(dat==0) break; k=new link; k->adj=NULL; if(flag==0) { p->adj=k; l=k; flag++; } else { l->adj=k; l=k; } q=start; while(q!=NULL) { if(q->data==dat) k->next=q; q=q->next; } } p=p->next; } cout<<" -------------------------"; return; } // Deapth First Search(DFS) Traversal. void bfs() { int qu[20],i=1,j=0; p=start; while(p!=NULL) { p->status=0; p=p->next; } p=start; qu[0]=p->data; p->status=1; while(1) { if(qu[j]==0) break; p=start; while(p!=NULL) { if(p->data==qu[j]) break; p=p->next; } k=p->adj; while(k!=NULL) { q=k->next; if(q->status==0) { qu[i]=q->data; q->status=1; qu[i+1]=0; i++; } k=k->adj; } j++; } j=0; cout<<" Breadth First Search Results "; cout<<" --------------------------- "; while(qu[j]!=0) { cout<<qu[j]<<" "; j++; } getch(); return; } // Breadth First Search(BFS) Traversal. void dfs() { int stack[25],top=1; cout<<" Deapth First Search Results "; cout<<" --------------------------- "; p=start; while(p!=NULL) { p->status=0; p=p->next; } p=start; stack[0]=0; stack[top]=p->data; p->status=1; while(1) { if(stack[top]==0) break; p=start; while(p!=NULL) { if(p->data==stack[top]) break; p=p->next; } cout<<stack[top]<<" "; top--; k=p->adj; while(k!=NULL) { q=k->next; if(q->status==0) { top++; stack[top]=q->data; q->status=1; } k=k->adj; } } getch(); return; }

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