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 lwm1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = { 10, 20, 30, 40, 50 }; for (int i = 0; i < a.length; i++) { System.out.println(a[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; public class lwm2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[5]; Scanner input = new Scanner(System.in); 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 lwm3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char a[] = { 'c', 'h', 'i', 'n', 'a' }; for (int i = 0; i < a.length; i++) { System.out.print(a[i]); } } }
4.输入5个学生成绩,求总分和平均分
import java.util.Scanner; public class lwm4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("输入五个学生成绩"); double a[] = new double[5]; Scanner input = new Scanner(System.in); double sum = 0; double avg; for (int i = 0; i < a.length; i++) { a[i] = input.nextDouble(); sum += a[i]; } System.out.println(sum); avg = sum / 5; System.out.println(avg); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
public class lwm5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = { 12, 53, 23, 44, 53 }; System.out.println("for输出"); for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } System.out.println("foreach输出"); for (int i : a) { System.out.println(i); } System.out.println("倒序输出"); for (int i = a.length - 1; i >= 0; i--) { System.out.println(a[i]); } } }
作业:
1.定义一个整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数
public class lwm1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[]={1,2,3,4,5}; int b=0; int c=0; for (int i = 0; i < a.length; i++) { if (a[i]%2!=0) { b++; } else{ c++; } } System.out.println("奇数个数"+b); System.out.println("偶数个数"+c); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
public class lwm2 { /** * @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; } for (int i = 0; i < a.length; i++) { 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; public class lwm3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入十个学生成绩"); double a[] = new double[10]; for (int i = 0; i < a.length; i++) { a[i] = input.nextDouble(); } System.out.println("加分后成绩"); for (int i = 0; i < a.length; i++) { a[i] = a[i] + 5; if (a[i] > 100) { System.out.println(a[i] = 100); } else { System.out.println(a[i]); } } } }