4.9上机作业
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
dome;
import
java.util.Scanner;
public
class
Dome4 {
public
static
void
main(String[] args) {
int
arr[] = {
10
,
20
,
30
,
40
,
50
};
for
(
int
i =
0
;i<
5
;i++) {
System.out.println(arr[i]);
}
}
}
2.编写一个简单程序,要求数组长度为5,动态赋值10,20,30,40,50,在控制台输出该数组的值。
package a;
import java.util.*;
public class aa {
public static void main(String[] args) {
// TODO Auto-generated method stub;
int[] a = new int[6];
for (int i = 1; i < a.length; i++) {
a[i]+=a[i-1]+10;
System.out.print(a[i] + " ");
}
}
}
3.编写一个简单程序,定义整型数组,里面的元素是{23,45,22,33,56},求数组元素的和、平均值。
package
dome;
public
class
Dome4 {
public
static
void
main(String[] args) {
int
[] arr = {
23
,
45
,
22
,
33
,
56
};
double
pj =
0
;
int
sum =
0
;
for
(
int
i =
0
;i<
5
;i++) {
sum+=arr[i];
}
System.out.println(
"sum="
+sum+
"平均值为"
+sum/
5
);
}
}
4.在一个有8个整数(18,25,7,36,13,2,89,63)的数组中找出其中最大的数及其下标。
package a;
import java.util.*;
public class aa {
public static void main(String[] args) {
// TODO Auto-generated method stub;
int[] a = new int[] { 18, 25, 7, 36, 13, 2, 89, 63 };
int max = a[0];
for (int i = 0; i < a.length; i++) {
if (max < a[i]) {
max = a[i];
}
}
System.out.println("最大值是:" + max);
int count = 0;
for (int i = 0; i < a.length; i++) {
if (a[i] == max) {
System.out.println("下标值是:" + count);
}
count++;
}
}
}
5. 将一个数组中的元素逆序存放
package wang;
public class li {
public static void main(String[] args){
int[] a = {8,1,2,3,4};
int m;
for(int i = 0; i < 2; i++){
m = a[i];
a[i] = a[5-i-1];
a[5-i-1] = m;
}
for(int j =0; j < 5; j++){
System.out.println(a[j]);
}
}
}