第七周作业
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。
package com.dq.homework; 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 com.dq.homework; import java.util.Scanner; public class test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("请输入5个数"); Scanner input = new Scanner(System.in); int a[] = new int[5]; for (int i = 0; i < 5; i++) { a[i] = input.nextInt(); } for (int i = 0; i < 5; i++) { 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 com.dq.homework; public class test3 { /** * @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 < 5; i++) { System.out.println(a[i]); } } }
4.输入5个学生成绩,求总分和平均分
package com.dq.homework; import java.util.Scanner; public abstract class test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入五个成绩"); int a[] = new int[5]; int sum = 0; for (int i = 0; i < 5; i++) { a[i] = input.nextInt(); while (a[i] > 100 || a[i] < 0) { System.out.println("重新输入"); a[i] = input.nextInt(); } sum += a[i]; } System.out.println("总分:" + sum); System.out.println("平均分:" + 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 com.dq.homework; public class test5 { /** * @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 < 5; i++) { System.out.println(a[i]); } System.out.println(); for (int i : a) { System.out.println(i); } System.out.println(); for (int i = 4; i>=0; i--) { System.out.println(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 com.dq.homework; import java.util.Scanner; public class homework3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入5个数"); int a[] = new int[5]; int j = 0; int o = 0; for (int i = 0; i < 5; i++) { a[i] = input.nextInt(); if (a[i] % 2 == 0) { j++; } else{ o++; } } System.out.println("奇数个数是:" + j); System.out.println("偶数个数是" + o); } }
2..生成一个100长度数组,里面的数分别是1-100,并输出
package com.dq.homework; public class homework2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[100]; for (int i = 1; i < 101; i++) { a[i - 1] = i; } for (int i = 0; i < 100; 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。
package com.dq.homework; import java.util.Scanner; public class homework1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("请输入十个学生成绩"); Scanner input = new Scanner(System.in); double a[] = new double[10]; for (int i = 0; i < 10; i++) { a[i] = input.nextDouble(); while (a[i] > 100 || a[i] < 0) { System.out.println("重新输入"); a[i] = input.nextDouble(); } a[i] += 5; if (a[i] > 100) { a[i] = 100; } System.out.println("成绩为:" + a[i]); } } }