Question

Search for an element input by the user in a given (array for java/ List for Python) using binary search.

Enter size of list:5
Enter element in List:
1:10
2:20
3:30
4:40
5:50
Elements in given list:
[10, 20, 30, 40, 50]
Enter Element to be searched:30
Element is available at index: 3

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Code

Java

Python

Java

import java.util.Scanner;
public class BinarySearch
{
    public static void main(String[]args)
    {
        int size=0,lower=0,upper=0,M=0,arr[],i=0;
        boolean flag=false;
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter size of given Array:");
        size=sc.nextInt();
        arr=new int[size];
        System.out.println("Enter elements in array:");
        for(i=0;i< size;i++)
        {
            arr[i]=sc.nextInt();
        }
        System.out.println("Elements in given array:");
        for(i=0;i< size;i++)
        {
            System.out.print(arr[i]+" ");
        }
        System.out.println();
        upper=arr.length-1;
        System.out.println("Enter the elements to be searched");
        int s=sc.nextInt();
        while(lower<=upper)
        {
            M=(lower+upper)/2;
            if(s==arr[M])
            {
                System.out.println("Element is available at index "+(M+1));
                flag=true;
                break;
            }
            else if(s>arr[M])
            {
                lower=M+1;
            }
            else
            {
                upper=M-1;
            }
        }
        if(flag==false)
        {
            System.out.println("Search element not found");

        }
    }
}

Python

li=[]
size=int(input("Enter size of list:"))
print("Enter element in List:")
for i in range(0,size):
    print((i+1),end=":")
    li.append(int(input()))
print("Elements in given list:")
print(li)

lower=0
upper=len(li)-1
mid=0
flag=False
elementToBeSearched=int(input("Enter Element to be searched:"))

while(lower<=upper):
    mid=(lower+upper)//2
    if(li[mid]==elementToBeSearched):
        print("Element is available at index:",(mid+1))
        flag = True
        break
    elif(li[mid]< elementToBeSearched):
        lower=mid+1
    else:
        upper=mid-1
if(flag==False):
    print(elementToBeSearched,"not found in given List")