Java第五次作业
上机作业:
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。(知识点:循环语句)
import java.util.Random; import java.util.Scanner; import javax.print.DocFlavor.INPUT_STREAM; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int sum = 0; for (int i = 1; i <= 100; i++) { if(i%3==0) sum += i; } System.out.println(sum); } }
import java.util.Random; import java.util.Scanner; import javax.print.DocFlavor.INPUT_STREAM; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int sum = 0; int i = 0; while (i <= 100) { if(i%3==0) sum += i; i++; } System.out.println(sum); } }
import java.util.Random; import java.util.Scanner; import javax.print.DocFlavor.INPUT_STREAM; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int sum = 0; int i = 0; do{ if(i%3==0) 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。(知识点:条件、循环语句)
public class as { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int i = 0; while (i <= 9) { if (i != 5) System.out.println(i); i++; } } }
3、编写一个程序,求整数n的阶乘,例如5的阶乘是1*2*3*4*5(知识点:循环语句)
import java.util.Scanner; public class as { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int n = input.nextInt(); int sum = 1; while (n > 0) { sum *= n; n--; } System.out.println(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(知识点:循环语句)
import java.util.Scanner; public class as { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int a = input.nextInt(); while (a < 0 | a > 100) { System.out.println("输入错误"); int n = input.nextInt(); a = n; } System.out.println(a); } }
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。(知识点:循环语句)
import java.util.Scanner; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); double a = 30000; double sum = 30000; int i = 2; while (i <= 10) { a = a * 106 / 100; sum += a; i++; } System.out.println(a); System.out.println(sum); } }
6、打印出所有的"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",因为153=1的三次方+5的三次方+3的三次方。(知识点:循环语句、条件语句)
import java.util.Scanner; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int i=100; while (i<1000) { int bai=i/100; int shi=i/10%10; int ge=i%10; int a=bai*bai*bai+shi*shi*shi+ge*ge*ge; if(a==i) System.out.println(i); i++; } } }
7、输入年月日,判断这是这一年中的第几天(知识点:循环语句、条件语句)
import java.util.Scanner; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int year = input.nextInt(); int month = input.nextInt(); int day = input.nextInt(); int sum = 0; int i = 0; int days = 0; while (i < month) { if (i == 1 | i == 3 | i == 5 | i == 7 | i == 8 | i == 10 | i == 12) { days = 31; } if (i == 4 | i == 6 | i == 9 | i == 11) { days = 30; } if (i == 2) { if (year % 4 == 0 & year % 100 != 0 | year % 400 == 0) { days = 29; } else { days = 28; } } sum += days; i++; } sum += day; System.out.println(sum); } }
8、由控制台输入一个4位整数,求将该数反转以后的数,如原数为1234,反转后的数位4321(知识点:循环语句、条件语句)
import java.util.Random; import java.util.Scanner; import javax.print.DocFlavor.INPUT_STREAM; public class z { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int i=input.nextInt(); int qian=i/1000; int bai=i/100%10; int shi=i/10%10; int ge=i%10; int a=ge*1000+shi*100+bai*10+qian; System.out.println(a); } }