C program to implement Binary Search

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Simple C program to implement Binary Search Algorithm

Code:

#include<stdio.h>

#include<conio.h>

void main()

{

    int n, i, arr[50], search, first, last, middle;

            printf("Enter total number of elements :");

            scanf("%d",&n);

            printf("Enter %d numbers :", n);

            for (i=0; i<n; i++)

            {

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

            }

            printf("Enter a number to find :");

            scanf("%d", &search);

            first = 0;

            last = n-1;

            middle = (first+last)/2;

            while (first <= last)

            {

                        if(arr[middle] < search)

                        {

                                    first = middle + 1;

 

                        }

                        else if(arr[middle] == search)

                        {

                                    printf("%d found at location %d\n", search, middle+1);

                                    break;

                        }

                        else

                        {

                                     last = middle - 1;

                        }

                        middle = (first + last)/2;

            }

            if(first > last)

            {

                        printf("Not found! %d is not present in the list.",search);

            }

            getch();

}


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