1、打印下列图形
* *
*** * *
***** * * *
******* * * * *
***** * * *
*** * *
* *
图形一：
public class HomeWork8_24 {
public static void main(String[] args) {
for (int i = 1; i <= 4; i++) {
for (int x = 1; x <= 4 - i; x++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
for (int i = 3; i >= 1; i--) {
for (int x = 1; x <= 4 - i; x++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
图形二：
public class HomeWork8_24 {
public static void main(String[] args) {
for (int i = 1; i <= 5; i++) {
for (int x = 1; x <= 5 - i; x++) {
System.out.print(" ");
}
for (int j = 1; j <= i - 1; j++) {
System.out.print("* ");
}
System.out.println();
}
for (int i = 4; i >= 1; i--) {
for (int x = 1; x <= 5 - i; x++) {
System.out.print(" ");
}
for (int j = 1; j <= i - 1; j++) {
System.out.print("* ");
}
System.out.println();
}
}
}
2、打印出1-1000以内的所有“水仙花数”，所谓“水仙花数”是指一个三位数，其各位数字立方和等于该数本身。例如：153是一个“水仙花数”。
public class HomeWork8_24 {
public static void main(String[] args) {
for (int i = 100; i <= 999; i++) {
if ((i % 10)*(i % 10)*(i % 10)+(i/10%10)*(i/10%10)*(i/10%10)+(i/100)*(i/100)*(i/100)==i){
System.out.println(i);
}
}
}
}
3、
①
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请随机输入一个数:");
int num = scanner.nextInt();
int sum = 0;
int[] l1 = new int[]{8, 4, 2, 1, 23, 344, 12};
for (int i = 0; i < l1.length; i++) {
System.out.println(l1[i]);
sum += l1[i];
}
System.out.println("所有数值的和为：" + sum);
for (int i = 0; i < l1.length; i++) {
if (num == l1[i]) {
System.out.println("数列中包含此数");
break;
}
if(num!=l1[i] && i==(l1.length-1)){
System.out.println("数列中不包含此数");
}
}
scanner.close();
}
}
②
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入4家店的价格");
int[] prices = new int[4];
int min = 3200;
for (int i = 0; i < 4; i++) {
System.out.print("第" + (i + 1) + "家店的价格：");
prices[i] = scanner.nextInt();
if (min > prices[i]){
min = prices[i];
}
}
System.out.println("最低价格是：" + min);
}
}
③
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入会员本月的消费记录");
double[] prices = new double[5];
int sum = 0;
for (int i = 0; i < 5; i++) {
System.out.print("请输入第" + (i + 1) + "笔购物金额：");
prices[i] = scanner.nextDouble();
}
System.out.println("序号 金额（元）");
for (int i = 0; i < 5; i++) {
System.out.println((i + 1) + " " + prices[i]);
sum += prices[i];
}
System.out.println("总金额 " + sum);
}
}
4、通过键盘输入10个不同的整数，然后实现倒序保存并输出。如输入1，2，3，4，5，倒序后是 5，4，3，2，1并输出。要求用数组实现。遍历 交换
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int[] l1 = new int[10];
int[] l2 = new int[10];
System.out.println("请输入10个不同的整数：");
for (int i = 0; i < 10; i++) {
l1[i] = scanner.nextInt();
l2[9-i] = l1[i];
}
for (int i = 0; i < 10; i++) {
System.out.println(l2[i] + " ");
}
}
}
5、通过键盘输入5个整数，将这5个整数按逆时针顺序转动一次后再输出，如输入1，2，3，4，5，逆时针转动一次后，输出2，3，4，5，1。要求用数组实现。遍历插入
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int[] l1 = new int[5];
int[] l2 = new int[5];
System.out.println("请输入5位整数：");
for (int i = 0; i < 5; i++) {
System.out.print("第" + (i + 1) + "位整数为：");
l1[i] = scanner.nextInt();
}
for (int i = 0; i < 5; i++) {
if (i < 4){
l2[i] = l1[i+1];
}else {
l2[i] = l1[4-i];
}
}
for (int i = 0; i < 5; i++) {
System.out.print(l2[i] + " ");
}
}
}
6、有n个人围成一圈，从头开始循环报1-3，报到3的人出局，求最后剩下的那个人。
import java.util.Scanner;
public class HomeWork8_24 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入总人数：");
int n = scanner.nextInt();
scanner.close();
boolean[] in = new boolean[n];//定义一个人是否在圈内的数组，在为true，不在为false;
for (int i = 0; i < n; i++) {
in[i] = true;
}
int sum = n;//圈内的人数
int num = 0;//报到的数
int index = 0;//索引
while (sum > 1) {
if (in[index]) {//假定索引为index的人在圈内
num++;
if (num == 3) {
num = 0;
in[index] = false;
sum--;
}
}
index++;
if (index == n) {
index = 0; //当索引的值等于n时把0赋值给索引，重新开始循环
}
}
for (int i = 0; i < n; i++) {
if (in[i]) {
System.out.println("留下的人为原来的第" + (i + 1) + "个人");
}
}
}
}
标签：java,一维,int,System,Scanner,数组,l1,public,out
From： https://www.cnblogs.com/hsk991213/p/17658098.html