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 xg; import java.util.Scanner; public class Test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method 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 xg; import java.util.Scanner; public class Test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method int a[] = new int[5] ; Scanner input=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } } }
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 xg; import java.util.Scanner; public class Test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method char a[] = new char[]{'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 xg; import java.util.Scanner; public class Test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method int a[] = new int[5] ; double sum=0,b=0; Scanner input=new Scanner(System.in); System.out.println("请输入成绩"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); sum+=a[i]; b=sum/5.0; } System.out.println("总和为"+sum+"平均为"+b); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出(for)
package xg; public class Test5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[] {12,53,23,44,53}; for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } for (int i = 4; i >=0; i--) { System.out.println(a[i]); } } }
1.定义一个长度为10的整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数
package xg; public class Test5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[] {1,2,3,4,5,6,7,8,9,10}; int b=0,c=0; for (int i = 0; i < a.length; i++) { if(a[i]%2==0){ b++; } else c++; } System.out.print("积数个数为"+b+"偶数个数为"+c); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package xg; import java.util.Scanner; public class Test5 { /** * @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++) { for (int j = 1; j < 101; j++) { a[i] = j; System.out.println(a[i]); } break; } } }
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 xg; import java.util.Scanner; public class Test5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); double a[] = new double[10]; for (int i = 0; i < a.length; i++) { a[i] = input.nextInt(); if (a[i] >= 95) { a[i] = 100; } else a[i] = a[i] + 5; System.out.println(a[i]); } } }