第五次Java作业
- 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 ljh;
public class dsa {
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 ljh;
public class dsa {
public static void main(String[] args) {
// TODO Auto-generated method stub
int []a= new int[5];
a[0]=1;
a[1]=2;
a[2]=3;
a[3]=4;
a[4]=4;
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 ljh;
public class dsa {
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.println(a[i]);
}
}
}
4.输入5个学生成绩,求总分和平均分
package ljh;
import java.util.Scanner;
public class dsa {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[]a=new int[5];
Scanner sc=new Scanner(System.in);
for (int i = 0; i < a.length; i++) {
System.out.println("请输入第"+(i+1)+"学生");
a[i]=sc.nextInt();
}
System.out.println("总分");
int sum=0;
for (int j = 0; j < a.length; j++) {
sum+=a[j];
}
System.out.println(sum);
System.out.println("平均分");
double x=sum/5;
System.out.println(x);
}
}
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package ljh;
import java.util.Scanner;
public class dsa {
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.length-1;i>=0; i--)
System.out.println(a[i]);
}
}
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 ljh;
import java.util.Scanner;
public class dsa {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("请输入十个数");
int x=0;
int y=0;
int[]z=new int[10];
for (int i = 0; i < z.length; i++) {
z[i]=input.nextInt();
if (z[i]%2==0) {
x++;
} else {
y++;
}
}
System.out.println("奇数"+y);
System.out.println("偶数"+x);
}
}
7.生成一个100长度数组,里面的数分别是1-100,并输出
package ljh;
import java.util.Scanner;
public class dsa {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[]a=new int[100];
for (int i = 0; i < a.length; i++) {
a[i]=i+1;
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 ljh;
import java.util.Scanner;
public class dsa {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("请输入10位学生成绩:");
double[]a=new double[10];
for (int i = 0; i < a.length; i++) {
a[i]=input.nextDouble();
if (a[i]<95) {
a[i]+=5;
} else {
a[i]+=5;
}
}
System.out.println("加分后成绩为:");
for (int i = 0; i < a.length; i++) {
System.out.println(a[i]);
}
}
}