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 test;
public class test_1 {
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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
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++) {
System.out.println("请输入第"+(i+1)+"个数");
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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
char a[]= {'c','h','i','n','a'};
for (char i:a) {
System.out.print(i);
}
}
}
4.输入5个学生成绩，求总分和平均分
package test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input = new Scanner(System.in);
double[] s = new double[5];
for (int i = 0; i < s.length; i++) {
System.out.println("输入第" + (i + 1) + "个学生成绩");
s[i] = input.nextDouble();
}
int sum=0;
for (int i = 0; i < s.length; i++) {
sum+=s[i];
}
System.out.println("学生总成绩为"+sum);
System.out.println("学生成绩的平均值"+(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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
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 test;
import java.util.Iterator;
import java.util.Scanner;
public class test_1 {
public static void main(String[] args) {
// TODO Auto-generated method stub
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 测试;
import java.util.Scanner;
public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
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);
}
