Conditional Constructs in Java

Chapter 8

Conditional Constructs in Java

Class 10 - Logix Kips ICSE Computer Applications with BlueJ

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Java Program: Analysis of Positive and Negative Integers

11. Write a program to input n number of integers and find out:

i. Number of positive integers

ii. Number of negative integers

iii. Sum of positive numbers

iv. Product of negative numbers

v. Average of positive numbers

Java

import java.util.Scanner;
 
public class IntegerAnalysis {
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
 
        int n;
        int num;
        int countPos = 0, countNeg = 0;
        int sumPos = 0;
        int productNeg = 1;
 
        System.out.print("Enter number of integers: ");
        n = sc.nextInt();
 
        for (int i = 1; i <= n; i++) {
            System.out.print("Enter integer " + i + ": ");
            num = sc.nextInt();
 
            if (num > 0) {
                countPos++;
                sumPos += num;
            } else if (num < 0) {
                countNeg++;
                productNeg *= num;
            }
        }
 
        System.out.println("\nNumber of positive integers: " + countPos);
        System.out.println("Number of negative integers: " + countNeg);
        System.out.println("Sum of positive integers: " + sumPos);
 
        if (countNeg > 0)
            System.out.println("Product of negative integers: " + productNeg);
        else
            System.out.println("Product of negative integers: Not applicable");
 
        if (countPos > 0)
            System.out.println("Average of positive integers: " + (sumPos / (double) countPos));
        else
            System.out.println("Average of positive integers: Not applicable");
 
        sc.close();
    }
}

Output

Sample Input / Output

Enter number of integers: 5
Enter integer 1: 4
Enter integer 2: -2
Enter integer 3: 6
Enter integer 4: -3
Enter integer 5: 5

Number of positive integers: 3
Number of negative integers: 2
Sum of positive integers: 15
Product of negative integers: 6
Average of positive integers: 5.0

📝 Explanation

countPos → counts positive numbers
countNeg → counts negative numbers
sumPos → accumulates sum of positive numbers
productNeg → multiplies negative numbers
Average of positives =

sum of positive numbers / number of positive numbers

Zero is ignored (neither positive nor negative)