Android Interview Questions

Count how many numbers are negative in an array?

Approach:

• Assume array of integer arr = [5,-9,66,-8,37]
• As  we know a negative number is a real number less than zero
• We are going to apply the same logic here , and check the number of negative numbers in the array.
• Expected output is : 2 ,since there are 2 negative numbers among the set of numbers
• 
  

Implementing in Java

/* Read input from STDIN. Print your output to STDOUT*/

import java.io.*;

import java.util.*;

public class CountNegativeNumbers{

  public static void main(String args[] ) throws Exception {

//Write code here

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();    // takes user input

int a[] = new int[n];  // creates array depending on the user input

int count=0;             //count variable which is zero initially

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

   a[i]=scan.nextInt();

 //stores array element inserted by user intoarray

   if(a[i]<0){        //check if array element is a negative number

    

      count ++;     //increase count if the element is negative

   }

}

System.out.println(count);    //prints the count of negative numbers

  }

}

Output :

2

Happy coding😊

Sushmitha N

Hi there ! Im a experienced android developer with 4 years of relevant experience Skills include Android,Core Java ,Oops and Kotlin.