Java第七周作业
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 jj; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a=new int[]{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 jj; 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个元素"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } 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 jj; 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 jj; import java.util.Scanner; public class test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int sum=0,ave=0; int []a=new int[5]; Scanner input=new Scanner(System.in); System.out.println("请输入5个学生成绩"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } for (int i = 0; i < a.length; i++) { sum+=a[i]; ave=sum/5; } System.out.println("总分"+sum); System.out.println("平均分"+ave); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package jj; public class test5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("for"); int[] a=new int[]{12,53,23,44,53}; for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } System.out.println(); System.out.println("foreach"); for (int i : a) { System.out.println(+i); } System.out.println(); System.out.println("倒序"); for (int i = 4; i >=0; i--) { System.out.println(+a[i]); } } }
1.定义一个整型数组,赋值后求出奇数个数和偶数个数
package cc; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int []a=new int[5]; int b=0,c=0; System.out.println("请输入五个数字"); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } for (int i = 0; i < a.length; i++) { if(a[i]%2==0&&a[i]!=0){ b++; } if(a[i]%2!=0&&a[i]!=0) c++; } System.out.println("奇数个数为"+c+"\t"+"偶数个数为"+b); } }
2.定义一个数组,求数组中的最大值和最小值
package cc; public class test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int[100]; for (int i = 0; i < 100; i++) { a[i] = i + 1; } for (int i = 0; i < a.length; i++) { 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 cc; import java.util.Scanner; public class test3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入10名学生成绩"); double []a=new double[10]; for (int i = 0; i < a.length; i++) { a[i]=input.nextDouble(); } for (int i = 0; i < a.length; i++) { a[i]+=5; if (a[i]>100) { a[i]=100; } } System.out.println("加分后的成绩为"); for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } } }