上机作业-马文龙
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
package sjtest3; public class test4 { public static void main(String[] args) { // TODO Auto-generated method stub int[]arr={10,20,30,40,50}; System.out.println(arr[0]); System.out.println(arr[1]); System.out.println(arr[2]); System.out.println(arr[3]); System.out.println(arr[4]); } }
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 sjtest3; public class test4 { public static void main(String[] args) { // TODO Auto-generated method stub int[]arr=new int[5]; arr[0]=10;arr[1]=20;arr[2]=30;arr[3]=40;arr[4]=50; System.out.println(arr[0]); System.out.println(arr[1]); System.out.println(arr[2]); System.out.println(arr[3]); System.out.println(arr[4]); } }
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 sjtest3; public class test4 { public static void main(String[] args) { // TODO Auto-generated method stub int [] a = {23,45,22,33,56}; double sum = 0; for(int i = 0; i < a.length; i++) { sum = sum + a[i]; } System.out.println("数组元素的和是:" + sum); System.out.println("数组元素的平均值是:" + sum / a.length); } }
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 sjtest3; public class test4 { public static void main(String[] args) { // TODO Auto-generated method stub int[] arr={18,25,7,36,13,2,89,63}; int max=arr[0]; int a=6; for(int i=1;i<arr.length;i++){ if(arr[i]>max){ max=arr[i]; } } System.out.println("最大值是"+max); System.out.println(a); } }
5. 将一个数组中的元素逆序存放(知识点:数组遍历、数组元素访问)
package sjtest3; public class test4 { public static void main(String[] args) { // TODO Auto-generated method stub int [] a = {23,56,7,94,15,2,35,73}; for (int i = 0; i < a.length / 2; i++) { int t = a[i]; a[i] = a[a.length - 1 - i]; a[a.length - 1 - i] =t; } for (int i = 0; i < a.length; i++) { System.out.print(a[i] + " "); } } }
6、有一个已经排好序的数组。现输入一个数,要求按原来的规律将它插入数组中。(附加题)