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。
package test1; public class test1 { /** * @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 < 5; 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。
package test1; import java.util.Scanner; public class test1 { /** * @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 < 5; 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
package test1; public class test2{ /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char[] a = { 'c', 'h', 'i', 'n', 'a' }; for (char c : a) { System.out.println(c); } } }
4.输入5个学生成绩,求总分和平均分
package test1; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("请输入5个学生的成绩"); int[]a=new int [5]; int sum=0; Scanner input=new Scanner(System.in); for(int i=0;i<a.length;i++){ a[i]=input.nextInt(); sum+=a[i]; } System.out.println(sum); System.out.println(sum/5); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package test1; public class test1{ /** * @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.print(a[i] + " "); } System.out.println(""); for (int i : a) { System.out.print(i + " "); } System.out.println(""); for (int i = a.length - 1; i >= 0; i--) { System.out.print(a[i] + " "); } } }
作业:
1.定义一个整型数组,赋值后求出奇数个数和偶数个数
package test1; public class test1{ /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] b = { 1, 2,3,45,88,62,41,87,96,55 }; int m = 0; int n = 0; for (int i = 0; i < b.length; i++) { if (b[i] % 2 == 0) { m++; } else { n++; } } System.out.println("偶数的个数为" + m + "奇数的个数为" + n); } }
2.定义一个数组,求数组中的最大值和最小值
package test1; public class test1{ /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int min = 0; int max = 0; int a[] = new int[]{55,48,65,85,25}; for (int i = 0; i < a.length; i++) { min = a[0]; max = a[0]; if (a[i] > max) { max = a[i]; } if (min > a[i]) { min = a[i]; } } System.out.println("最小值为:" + min); System.out.println("最大值为:" + max); } }
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。
package test1; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); double[] a = new double[10]; for (int i = 0; i < a.length; i++) { a[i] = input.nextDouble(); a[i] += 5; if (a[i] >= 100) { a[i] = 100; } } for (double d : a) { System.out.println(d); } } }