Java 程序控制结构（4）

public class BreakExercise {
	public static void main(String[] args) {
 
		int sum = 0;
		int i = 1; 
		for(; i <= 100; i++) {
			sum += i;
			if(sum > 20) {
				System.out.println("和已经大于20");
				break;
			}
		}
		System.out.println("i=" + i);
	}
}

import java.util.Scanner;
public class Homework02 {
	public static void main(String[] args) {

		Scanner myScanner = new Scanner(System.in);
		System.out.println("请输入一个整数：");
		int a = myScanner.nextInt();
		if(a > 0) {
			System.out.println(a + "大于0");
		} else if(a < 0) {
			System.out.println(a + "小于0");
		} else {
			System.out.println(a + "等于0");
		}
	}
}

import java.util.Scanner;
public class Homework03 {
	public static void main(String[] args) {

		Scanner myScanner = new Scanner(System.in);
		System.out.println("请输入一个年份:");
		int year = myScanner.nextInt();
		if(year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
			System.out.println("该年为闰年");
		} else {
			System.out.println("该年不是闰年");
		}
	}
}

import java.util.Scanner;
public class Homework04 {
	public static void main(String[] args) {

		Scanner myScanner = new Scanner(System.in);
		System.out.println("请输入一个三位数：");
		int number = myScanner.nextInt();
		int a = number % 10;
		int b = number / 10 % 10;
		int c = number /100;
		if(number == a * a * a + b * b * b + c * c * c) {
			System.out.println("该数为水仙花数");
		} else {
			System.out.println("该数不是水仙花数");
		}

	}
}