### Searching Method in C - Linear Search/Binary Search/Depth first search

**Searching Method in C - Linear Search/Binary Search/Depth first search==========================================================**

Linear Search

=============

#include <stdio.h>

#include <conio.h>

void main ()

{

int array[20], n, sea_no, i, j;

int create (int []);

int linear_search (int [], int, int);

clrscr ();

n = create (array);

printf("\nEnter the number you want to search: ");

scanf ("%d",&sea_no);

clrscr ();

i = linear_search (array, n, sea_no);

if (i == 0)

printf ("\nSearch value does not exist");

else

printf("\nThe search value is at location %d\n",i);

printf("\nThe array is as follows:\n");

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

printf("%d ",array[j]);

getch ();

}

int create (int a[20])

{

int n, i;

printf("\nEnter how many numbers you want to enter(Enter less than 20): ");

scanf("%d",&n);

printf("\nEnter the numbers:\n");

for (i = 0 ; i < n ; i++)

scanf("%d",&a[i]);

return (n);

}

int linear_search (int a[], int n, int s)

{

int i;

for (i = 0 ; i < n ; i++)

{

if(s == a[i])

{

printf("\nSEARCH VALUE FOUND\n");

return (i+1);

}

}

return (0);

}

Binary Search

==============

#include <stdio.h>

#include <conio.h>

void main ()

{

int a[20], n, sea_no;

int create (int []);

void binary_search (int [], int, int);

clrscr ();

n = create(a);

printf("\nEnter the number you want to search: ");

scanf("%d",&sea_no);

clrscr ();

binary_search (a,n,sea_no);

getch ();

}

int create (int a[20])

{

int n, i;

do

{

printf("\nEnter how many numbers you want to enter(Enter less than 20): ");

scanf("%d",&n);

} while (n > 20);

if (n == 0)

{

printf("Invalid number, Press any key to exit\n");

getch ();

printf("Termenating the Program.....");

delay (1500);

exit (1);

}

printf("\nEnter the numbers in ascending order:\n");

for (i = 0 ; i < n ; i++)

scanf("%d",&a[i]);

return (n);

}

void binary_search (int a[], int n, int s)

{

int lb = 0,ub = n-1,mid, flag = 1, i;

while (lb <= ub)

{

mid = (lb + ub)/2;

if (s < a[mid])

ub = mid - 1;

if (s > a[mid])

lb = mid + 1;

if (s == a[mid])

{

flag = 0;

printf("\nSEARCH FOUND\n");

printf("\nThe number you want to search is at location %d\n",mid + 1);

printf("\nThe elements are as follows:\n");

for (i = 0 ; i < n ; i++)

printf("%d ",a[i]);

break;

}

}

if (flag == 1)

{

printf("\nSearch element does not found");

}

}

Depth first search

===============

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

#include<malloc.h>

#define size 20

#define T 1

#define F 0

struct Edge

{

int terminal;

struct Edge *next;

};

struct Vertex

{

int visit;

int vertexno;

char info;

int path_length;

struct Edge *edgeptr;

};

void table(int vertexno,int matrix[size][size],struct Vertex vert[size]);

struct Edge *insert_vertex(int vertexno,struct Edge * first);

void dfs(int index,int *dist,struct Vertex vert[size]);

void output(int number,int a[size][size]);

void input(int number,int a[size][size]);

struct Edge *insert_vertex(int vertexno, struct Edge *first)

{

struct Edge * newl,*current;

newl = (struct Edge *)malloc(sizeof(struct Edge));

newl->terminal = vertexno;

newl->next = NULL;

if(first)

return(newl);

for(current = first; current->next;current=current->next)

current->next = newl;

return(first);

}

void table(int vertexno,int matrix[size][size],struct Vertex vert[size])

{

int i,j;

for(i=0;i<vertexno;i++)

{

vert[i].visit = F;

vert[i].vertexno = i+1;

vert[i].info = 'A' + i;

vert[i].edgeptr = NULL;

}

for(i=0;i<vertexno;i++)

for(j=0;j<vertexno;j++)

if(matrix[i][j] > 0)

vert[i].edgeptr = insert_vertex(j,vert[i].edgeptr);

}

void dfs(int index,int *dist,struct Vertex vert[size])

{

struct Edge *link;

vert[index].visit = T;

vert[index].path_length = *dist;

*dist += 1;

for(link = vert[index].edgeptr;link;link = link->next)

if(vert[link->terminal].visit == F)

dfs(link->terminal,dist,vert);

}

void input(int number,int a[size][size])

{

int i,j;

printf("\n Input the adjacency matrix \n");

for(i=0;i<number;i++)

{

for(j=0;j<number;j++)

{

scanf("%d",&a[i][j]);

}

printf("\n");

}

}

void output(int number,int a[size][size])

{

int i,j;

printf("\n Input the adjacency matrix \n");

for(i=0;i<number;i++)

{

for(j=0;j<number;j++)

{

printf("%d",&a[i][j]);

}

printf("\n");

}

}

void main()

{

int i;

int number,index,dist;

int a[size][size];

struct Vertex vert[size];

struct Edge *list;

clrscr();

printf("\nInput the number of vertices in the graph : ");

scanf("%d",&number);

input(number,a);

output(number,a);

table(number,a,vert);

printf("\nInput the starting vertex %d : ",number-1);

scanf("%d",&index);

dist = 0;

dfs(index,&dist,vert);

printf("\nPath length of the vertex from %c ",vert[index].info);

printf("\nVertex Length Vertex Connectivity : \n ");

for(i=0;i<number;i++)

{

printf("\n %c %d",vert[i].info,vert[i].path_length);

for(list=vert[i].edgeptr;list;list=list->next)

{

printf(" ");

putchar(list->terminal+'A');

}

}

getch();

}

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