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 Java; import java.util.Scanner; public class laoyu { /** * @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 < 5; 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 Java; import java.util.Scanner; public class laoyu { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入五个数"); int a[]=new int[5]; for (int i = 0; i < 5; i++) { a[i]=input.nextInt(); } for (int i = 0; i < 5; 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 Java; import java.util.Scanner; public class laoyu { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); char a[]={'c','h','i','n','a'}; for (int i = 0; i < 5; i++){ System.out.print(a[i]); } } }
4.输入5个学生成绩,求总分和平均分
package Java; import java.util.Scanner; public class laoyu { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入五个学生成绩"); int a[]=new int[5]; int sum=0; double b=0; for (int i = 0; i < 5; i++){ a[i]=input.nextInt(); sum+= a[i]; } System.out.println("总分"+sum); b=sum/5.0; System.out.println("平均分为"+b); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package Java; import java.util.Scanner; public class laoyu { /** * @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){ i++; System.out.print(i+" "); } System.out.println(); for (int i=a.length-1; 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
import java.util.Scanner; public class TEst { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int j=1; int o=1; int a[] = {1,2,3,4,5,6,7,8,9}; for(int i = 0;i < 5;i++){ if(a[i] % 2 == 0){ o++; }else j++; } System.out.println("奇数有" + j + "个" + "偶数有" + o + "个"); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
public class TEst { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int a[] = new int [100]; for(int i = 0;i < 1;i++){ for(int j = 1;j < 101 ; j++){ a[i] = j; System.out.print(a[i]+" "); if(j%10==0) System.out.println(); } } } }
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。
import java.util.Scanner; public class TEst { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double a[] = new double[10]; Scanner input = new Scanner (System.in); System.out.println("输入十名学生成绩"); for(int i = 0;i < a.length;i++){ a[i] = input .nextDouble(); } System.out.println("给所有同学加5分,最高不能超过100分"); for (int i = 0; i < a.length; i++) { a[i] += 5; if(a[i]>100){ a[i] = 100; } } for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } } }