JAVA第五周作业0402
package com.homwork5; //1~100之间所有能被3整除的数的和 for while do public class Test5_1_1 { public static void main(String[] args) { int sum1 = 0; for (int i = 1; i <= 100; i++) { if (i % 3 == 0) { sum1 += i; } } System.out.println(sum1);//for int j = 1; int sum2 = 0; while (j<=100) { if (j % 3 == 0) { sum2 += j; } j ++; } System.out.println(sum2);//while int k = 1; int sum3 = 0; do { if (k % 3 == 0) { sum3 += k; } k ++; } while (k<100); System.out.println(sum3); } }
package com.homwork5; public class Test5_1_2 { //输出0~9之间的数,不包括5 public static void main(String[] args) { for (int i = 0; i < 10; i++) { if (i!=5) { System.out.println(i); } } } }
package com.homwork5; import java.util.Scanner; //求整数n的阶乘 public class Test5_1_3 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个整数"); int n = input.nextInt(); int result = 1; for (int i = 1; i <= n; i++) { result *= i; } System.out.println(n + "!="+result); } }
package com.homwork5; import java.util.Scanner; public class Test5_1_4 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入学生成绩:"); int grade = input.nextInt(); for (; grade < 0 || grade > 100; ) { System.out.println("输入不合法!\n请重新输入0~100!"); grade = input.nextInt(); } System.out.println(grade); } }
package com.homwork5; public class Test5_1_5 { public static void main(String[] args) { double first = 30000; double sum =first; for (int i = 1; i <= 10; i++) { first *= 1.06; sum += first; } System.out.println("十年后的工资是" + first); System.out.println("十年后的总工资是" + sum); } }
package com.homwork5; public class Test5_2_1 { /** * 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) */ public static void main(String[] args) { for (int i = 100; i <= 999; i++) { int ge = i %10; int shi = i %100/10; int bai = i %1000/100; if (ge*ge*ge+shi*shi*shi+bai*bai*bai==i) { System.out.println(i); } } } }
package com.homwork5; import java.util.Scanner; //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) public class Test5_2_2 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入年"); int year = input.nextInt(); System.out.println("请输入月"); int month = input.nextInt(); System.out.println("请输入日"); int day= input.nextInt(); int sum = 0; switch (month-1) { case 12:sum +=31; case 11:sum +=30; case 10:sum +=31; case 9:sum +=30; case 8:sum +=31; case 7:sum +=31; case 6:sum +=30; case 5:sum +=31; case 4:sum +=30; case 3:sum +=31; case 2: if (year%4==0&&year%100!=0||year%400==0) { sum += 29; }else{ sum += 28; } case 1:sum +=31; default: break; } sum +=day; System.out.println("这是这一年中的第" + sum + "天!"); } }
package com.homwork5; import java.util.Scanner; public class Test5_2_3 { /* 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 */ public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个四位数的整数:"); int num = input.nextInt(); for (; 9999 < num || num < 1000 ;) { System.out.println("输入不合法!\n请重新输入一个四位数的整数"); num = input.nextInt(); } int ge = num %10 *1000; int shi = num %100 /10 *100; int bai = num %1000 /100 *10; int qian = num %10000 /1000; int sum = ge +shi +bai +qian; System.out.println(sum); } }