打印三角形
import java.util.Scanner;
public class Class01 {
public static void main(String[] args) {
demo1();
// 打印等腰三角形
demo2();
// 打印反等腰三角形
demo3();
demo4();
demo5();
demo6();
demo7();
}
// 菱形 未确定行数 (未完成）
private static void demo7() {
Scanner sc = new Scanner(System.in);
System.out.println("输入行数");
int n = sc.nextInt();
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
/*
* for (int i = (n - 1)/2-1; i >= 1; i--) {
*
* for (int j = 0; j <= (n + 1)/2-1; j++) { System.out.print(" "); } for
* (int k = 0; k < 2 * (n - i); k++) { System.out.print("*");
*
* }
*
* System.out.println(); }
*/
}
// 菱形 确定行数
private static void demo6() {
for (int i = 1; i <= 5; i--) {
for (int j = 1; j <= 5 - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
for (int i = 4; i >= 0; i--) {
for (int j = 1; j < 6 - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
// TODO Auto-generated method stub
}
// 不确定行数 反等腰三角形
private static void demo5() {
Scanner sc = new Scanner(System.in);
System.out.println("反等腰三角形行数");
int n = sc.nextInt();
for (int i = 0; i <= n; i++) {
for (int j = 0; j < i; j++) {
System.out.print(" ");
}
for (int k = 0; k < 2 * (n - i) - 1; k++) {
System.out.print("*");
}
System.out.println();
}
// TODO Auto-generated method stub
}
// 等腰三角形 不确定行数
private static void demo4() {
Scanner sc = new Scanner(System.in);
System.out.println("输入行数");
int n = sc.nextInt();
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
}
private static void demo3() {
// TODO Auto-generated method stub
}
// 反等腰三角形
private static void demo2() {
System.out.println("--------------");
for (int i = 6; i >= 0; i--) {
for (int j = 1; j <= 6 - i; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
}
// 等腰三角形
private static void demo1() {
for (int i = 1; i <= 5; i++) {
for (int j = 4 - i; j >= 0; j--) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}
System.out.println();
}
}
}
判断某年某月天数
import java.util.Scanner;
public class Test2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("亲输入年份");
int year = sc.nextInt();
System.out.println("输入月份");
int month = sc.nextInt();
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
int day = 31;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 31; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
} else if (month == 4 || month == 6 || month == 9 || month == 11) {
int day = 30;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 30; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
} else {
int day = 29;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 29; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
}
} else {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
int day = 31;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 31; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
} else if (month == 4 || month == 6 || month == 9 || month == 11) {
int day = 30;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 30; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
} else {
int day = 28;
System.out.println("本月有:" + day + "天");
System.out.println("日 一 二 三 四 五 六");
for (day = 1; day <= 3; day++) {
System.out.print(" ");
}
for (day = 1; day <= 28; day++) {
if (day % 7 == 4) {
System.out.println(day + " ");
} else {
if (day < 10) {
System.out.print(day + " ");
}
else {
System.out.print(day + " ");
}
}
}
}
}
}
}
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