Java第六次作业
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
package h;
import java.util.Scanner;
public class Test2 {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
int []a= {10,20,30,40,50};
System.out.println("输出为:");
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 h;
import java.util.Scanner;
public class Test1 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入:");
int[]a=new int[5];
for(int i=0;i<a.length;i++) {
a[i]=input.nextInt();
}
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 h;
import java.util.Scanner;
public class Test3 {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
String []a= {"c","h","i","n","a"};
System.out.println("输出为:");
for(int i=0;i<a.length;i++)
System.out.println(a[i]);
}
}
4.输入5个学生成绩,求总分和平均分
package h;
import java.util.Scanner;
public class Test4 {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
System.out.println("输入5名同学的成绩:");
int sum=0;
int[]a=new int[5];
for(int i=0;i<a.length;i++) {
a[i]=input.nextInt();
sum+=a[i];
}
float b=sum/5;
System.out.println("总分为:"+sum);
System.out.println("平均分为:"+b);
}
}
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.itheima.practice;
import java.util.Scanner;
public class Test33 {
public static void main(String[] args) {
System.out.println("结果为:");
Scanner input = new Scanner(System.in);
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);
}
}
}
package com.itheima.practice;
import java.util.Scanner;
public class Test34 {
public static void main(String[] args) {
System.out.println("结果为:");
Scanner input = new Scanner(System.in);
int a[]= {12,53,23,44,53};
System.out.println(a[4]);
System.out.println(a[3]);
System.out.println(a[2]);
System.out.println(a[1]);
System.out.println(a[0]);
}
}
6.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 com.itheima.practice;
import java.util.Scanner;
public class Test35 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
int a[]= {2,5,9,6,7,3,8,44,19,9};
int ou=0,ji=0;
for (int i = 0; i < a.length; i++) {
if(a[i]%2==0)
ou++;
else
ji++;
}
System.out.println("偶数个数是:"+ou);
System.out.println("奇数个数是:"+ji);
}
}
7.生成一个100长度数组,里面的数分别是1-100,并输出
package com.itheima.practice;
import java.util.Scanner;
public class Test36 {
public static void main(String[] args) {
System.out.println("结果为:");
Scanner input = new Scanner(System.in);
int a[]=new int[100];
for (int i = 0; i < a.length; i++) {
a[i]=i+1;
}
for (int i = 0; i < a.length; i++) {
System.out.println(a[i]);
}
}
}
8.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.itheima.practice;
public class Test37 {
public static void main(String[] args) {
System.out.println("结果为:");
double[] scores = {80.5, 90.0, 75.5, 85.0, 95.5, 70.0, 60.5, 88.0, 92.5, 87.0};
for (int i = 0; i < scores.length; i++) {
scores[i] += 5;
if (scores[i] > 100) {
scores[i] = 100;
}
}
for (double score : scores) {
System.out.println(score);
}
}
}