java第七次作业
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 work; public class test1 { /** * @param args */ 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 work; import java.util.Scanner; public class test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; Scanner input=new Scanner(System.in); System.out.println("请输入5个数"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } for (int i = 0; i < a.length; i++) { System.out.println("数组a的值有:"+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 work; public class test3 { /** * @param args */ 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 work; import java.util.Scanner; public class test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; int sum=0; double avg=1; Scanner input=new Scanner(System.in); System.out.println("请输入五名学生的成绩"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); sum+=a[i]; } avg=sum/5.0; System.out.println("五名学生的总成绩"+sum); System.out.println("五名学生的平均成绩"+avg); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package work; public class test5 { /** * @param args */ 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.print(a[i] + " "); } System.out.println(); for (int i : a) { System.out.print(i + " "); } System.out.println(); for (int i = 4; i >= 0; i--) { System.out.print(a[i] + " "); } } }
作业:
1.定义一个整型数组,赋值后求出奇数个数和偶数个数
package work; public class test6 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 12, 33, 69, 78, 89, 40, 55, 34, 90, 97 }; int b = 0; int c = 0; for (int i = 0; i < a.length; i++) { if (a[i] % 2 == 0) { b += 1; } else { c += 1; } } System.out.println("偶数的个数" + b); System.out.println("奇数的个数" +c); } }
2.定义一个数组,求数组中的最大值和最小值
package work; public class test7 { /** * @param args */ 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]); } } }
3.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 work; public class test8 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double []a={68,72,96,59,94,91,69,88,85,59}; for (int i = 0; i < a.length; i++) { if (a[i]>95) { a[i]=100; }else { a[i]+=5; } System.out.println(a[i]); } } }