第七次作业
1.编写一个简单程序,要求数组长度为5,静态赋值10,20,30,40,50,在控制台输出该数组的值。
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 10, 20, 30, 40, 50 }; for (int i : a) { System.out.println(i); } } }
2.编写一个简单程序,要求数组长度为5,动态赋值,并在控制台输出该数组的值。
import java.util.Scanner; import java.util.Random; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int[] a = new int[5]; for (int i = 0; i < a.length; i++) { a[i] = input.nextInt(); System.out.println(a[i]); } } }
3.定义字符型数组,分别存储c、h、 i、n、a 并在控制台输出
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char[] b = { 'c', 'h', 'i', 'n', 'a' }; for (int i = 0; i < b.length; i++) { System.out.println(b[i]); } } }
4.输入5个学生成绩,求总分和平均分
import java.util.Scanner; import java.util.Random; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int[] a = new int[5]; int sum = 0; double pj = 0; for (int i = 0; i <a.length; i++) { a[i] = input.nextInt(); sum += a[i]; pj = sum / 5; } System.out.println(sum); System.out.println(pj); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出(for)
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 12, 53, 23, 44, 53 }; for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } } }
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 12, 53, 23, 44, 53 }; for (int i : a) { System.out.println(i); } } }
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 12, 53, 23, 44, 53 }; for (int i = 4; i >= 0; i--) { System.out.println(a[i]); } } }
1.定义一个长度为10的整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; int js = 0; int os = 0; for (int i = 0; i <a.length; i++) { if (a[i] % 2 == 0) { os++; } if (a[i] % 2 != 0) { js++; } } System.out.println(os); System.out.println(js); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[100]; for (int i = 0; i < 100; i++) { a[i] = i + 1; System.out.println(a[i]); } } }
3.定义一个double数组,存放10个学生的成绩,给所有同学加5分,不能超过100分。
import java.util.Scanner; import java.util.Random; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double a[] = new double[10]; double sum = 0; Scanner input = new Scanner(System.in); for (int i = 0; i < a.length; i++) { System.out.println("输入第" + (i + 1) + "个学生成绩"); a[i] = input.nextInt(); } for (int i = 0; i < a.length; i++) { sum = a[i] + 5; if (sum >= 100) { System.out.println("加分后成绩为100分"); } else { System.out.println("加分后成绩为" + sum + "分"); } } } }