32. Write a program to print the sum of negative numbers, sum of positive even numbers and sum of positive odd numbers from a list of n numbers entered by the user. The program terminates when the user enters a zero.

Program Title: Sum of Negative, Positive Even, and Positive Odd Numbers

Java

import java.util.Scanner;
 
public class SumNumbers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        int sumNegative = 0;
        int sumPositiveEven = 0;
        int sumPositiveOdd = 0;
 
        System.out.println("Enter numbers (0 to terminate):");
 
        while (true) {
            int num = sc.nextInt();
 
            if (num == 0) {
                break; // terminate when 0 is entered
            }
 
            if (num < 0) {
                sumNegative += num;
            } else if (num > 0 && num % 2 == 0) {
                sumPositiveEven += num;
            } else if (num > 0 && num % 2 != 0) {
                sumPositiveOdd += num;
            }
        }
 
        System.out.println("Sum of negative numbers: " + sumNegative);
        System.out.println("Sum of positive even numbers: " + sumPositiveEven);
        System.out.println("Sum of positive odd numbers: " + sumPositiveOdd);
 
        sc.close();
    }
}

Output

Sample Input / Output
Enter numbers (0 to terminate):
5
-2
8
-7
3
0
Sum of negative numbers: -9
Sum of positive even numbers: 8
Sum of positive odd numbers: 8

How It Works

Use a while loop that runs indefinitely.
Read a number from the user. If it’s 0, break the loop.
Check the number:

If negative → add to sumNegative
If positive and even → add to sumPositiveEven
If positive and odd → add to sumPositiveOdd

Display all sums at the end.