根据屏幕提示输入一个正整数，然后求1到该整数的和、奇数和、偶数和并输出。

package chapter_after5;
import java.util.Scanner;

public class Five_1 {

	@SuppressWarnings("resource")
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.print("请输入一个正整数：");
		int num = input.nextInt();
		//整数和， 奇数和， 偶数和
		int sum, oddSum = 0, evenSum = 0;
		for (int i = 0; i <= num; i++) {
			if (i % 2 == 0) {
				evenSum += i;
			} else {
				oddSum += i;
			}
		}
		//整数和等于奇数和+偶数和
		sum = oddSum + evenSum;
		System.out.println("整数和为：" + sum);
		System.out.println("奇数和为：" + oddSum);
		System.out.println("偶数和为：" + evenSum);
	}
}

输出结果：