java第五次作业
1.分别使用for循环，while循环，do循环求1到100之间所有能被3整除的整数的和。
package School.Day6;
public class Test03 {
public static void main(String[] args){
int i = 1;
int sum = 0;
for( i = 1;i<=100;i++){
if(i%3 == 0){
sum = sum + i;
}
}
System.out.println(sum);
i = 1;
sum = 0;
while(i<=100){
if(i%3 == 0){
sum = sum + i;
}
i++;
}
System.out.println(sum);
sum = 0;
i = 1;
do{
if(i % 3 == 0){
sum = sum + i;
}
i++;
}while(i<=100);
System.out.println(sum);
}
}
2.输出0-9之间的数，但是不包括5。
package School.Day6;
public class Test04 {
public static void main(String[] args) {
for (int i = 0; i <= 9; i++) {
if (i != 5 ) {
System.out.println(i);
}
}
}
}
3.编写一个程序，求整数n的阶乘
package School.Day6;
import java.util.Scanner;
public class Test05 {
public static void main(String[] args) {
System.out.print("输入一个数: ");
Scanner s = new Scanner(System.in);
int x = s.nextInt();
int sum = 1;
for (int i = x; i > 0; i--) {
sum = sum * i;
}
System.out.println(x + "的阶乘是" +sum);
}
}
4.编写一个程序，输入任意学生成绩,如果输入不合法(<0或者>100),提示输入错误,重新输入,直到输入合法程序结束
package School.Day6;
import java.util.Scanner;
public class Test06 {
public static void main(String[] args){
Scanner s = new Scanner(System.in);
System.out.print("输入成绩: ");
double x = s.nextDouble();
while(true){
if(x>0 && x<100){
System.out.println("输入成功!");
return;
}else{
System.out.println("成绩不合法");
System.out.print("输入成绩: ");
x = s.nextDouble();
}
}
}
}
5．假设某员工今年的年薪是30000元，年薪的年增长率6%。编写一个Java应用程序计算该员工10年后的年薪，并统计未来10年（从今年算起）总收入。
package School.Day6;
public class Test07 {
public static void main(String[] args){
double gongzi = 30000.00;
double heji = 0;
for(int i = 1 ;i<=9;i++){
gongzi = gongzi + (gongzi * 0.06);
heji = heji + gongzi;
}
heji = heji + 30000;
System.out.println("十年后工资是: " + gongzi);
System.out.println("这十年工资合计是: " + heji);
}
}
1.打印出所有的"水仙花数"
package School.Day6;
public class Test02 {
public static void main(String[] args) {
for (int i = 100; i < 1000; i++) {
int a = i/100;
int b = i%100/10;
int c = i%10;
int a3 = a * a * a;
int b3 = b * b * b;
int c3 = c * c * c;
if (a3 + b3 + c3 ==i) {
System.out.println("水仙花: " + i);
}
}
}
}
2.输入年月日，判断这是这一年中的第几天
package School.Day6;
import java.util.Scanner;
public class Test01 {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("输入年份: ");
int y = s.nextInt();
System.out.print("输入月份: ");
int m = s.nextInt();
System.out.print("输入日: ");
int d = s.nextInt();
int tianshu = 0;
switch(m){
case 12:
tianshu = tianshu + 30;
case 11:
tianshu = tianshu + 31;
case 10:
tianshu = tianshu + 30;
case 9 :
tianshu = tianshu + 31;
case 8 :
tianshu = tianshu + 31;
case 7 :
tianshu = tianshu + 30;
case 6 :
tianshu = tianshu + 31;
case 5 :
tianshu = tianshu + 30;
case 4 :
tianshu = tianshu + 31;
case 3 :
if (y%4==0 && y%100 !=0 || y%400 ==0) {
tianshu = tianshu + 29;
}else{
tianshu = tianshu + 28;
}
case 2:
if (y%4==0 && y%100 !=0 || y%400 ==0) {
if (d > 29 && m == 2) {
System.out.println("2月最多29天!");
return;
}
}else{
if (d > 28 && m ==2) {
System.out.println("平年2月只有28天!");
return;
}
}
tianshu = tianshu + 31;
default:
break;
}
tianshu = tianshu + d;
System.out.println(y + "年" + m + "月" + d + "日是这一年的第" + tianshu +"天");
}
}
3.由控制台输入一个4位整数，求将该数反转以后的数
package School.Day6;
import java.util.Scanner;
public class Test08 {
public static void main(String[] args) {
Scanner c = new Scanner(System.in);
System.out.print("输入四位数: ");
int a = c.nextInt();
if (a > 9999 || a < 1000 ) {
System.out.println("数字错误!");
System.exit(0);
}
int s = a / 1000;
int h = a % 1000 /100;
int m = a % 100 /10;
int g = a % 10;
System.out.print(a + "的反转数为: " );
System.out.print(g);
System.out.print(m);
System.out.print(h);
System.out.print(s);
}
}
