第七次java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 SJ; public class SJ1 { 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。
package SJ; import java.util.Scanner; public class SJ2 { /** * @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("........"); for (int i = 0; i < a.length; 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 SJ; public class SJ3 { /** * @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
package SJ; import java.util.Scanner; public class SJ4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double a[] = new double[5]; double sum = 0; double pj = 0; Scanner input = new Scanner (System.in); System.out.println("请依次输入5名学生成绩"); for(int i = 0;i < a.length;i++){ a[i] = input.nextDouble(); } for(int i = 0; i < a.length;i++){ sum = sum + a[i]; } System.out.println(" 总分为 " + sum); pj = sum / 5; System.out.println("平均分为" + pj); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package SJ; public class SJ5 { /** * @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]); } System.out.println(".................................."); for(int i : a){ System.out.println(i); } System.out.println(".................................."); for(int i =a.length-1;i > -1;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
package SJ; import java.util.Scanner; public class SJ6 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int [5]; int js = 0; int os = 0; Scanner input = new Scanner (System.in); System.out.println("请输入5个整数"); for(int i = 0;i < 5;i++){ a[i] = input.nextInt(); if(a[i] % 2 == 0){ os++; }else js++; System.out.println("奇数有" + js + "个" + "偶数有" + os + "个"); } } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package SJ; import java.util.Scanner; public class SJ7 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int [100]; for(int i = 0;i < 1;i++){ for(int j = 1;j < 101 ; j++){ a[i] = j; 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 SJ; import java.util.Scanner; public class SJ8 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double a[] = new double[10]; Scanner input = new Scanner (System.in); for(int i = 0;i < a.length;i++){ a[i] = input .nextDouble(); } System.out.println("........"); for (int i = 0; i < a.length; i++) { a[i] += 5; if(a[i]>100){ a[i] = 100; }else{ a[i] = a[i]; } } for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } } }