第七周上机课作业
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 gkd; 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 gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; Scanner intput=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=intput.nextInt(); 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 gkd; import java.util.Scanner; public class test1 { /** * @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 gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[5]; int sum=0; Scanner intput=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=intput.nextInt(); sum+=a[i]; } System.out.println(sum/5); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
package gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a={12,53,23,44,53}; for (int i = (a.length-1); i >=0; i--) { System.out.println(a[i]); } for (int i : a) { System.out.println(i); } } }
作业
1.定义一个整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数
package gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a={12,53,23,44,53}; int num=0; int num1=0; for (int i = 0; i < a.length; i++) { if (a[i]%2==0) { num=num+1; } if (a[i]%2!=0||a[i]==0) { num1=num1+1; } } System.out.println(num); System.out.println(num1); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub for (int i = 0; i <= 100; i++) { int []a=new int[100]; Scanner input=new Scanner(System.in); System.out.println(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 gkd; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double []a=new double[10]; Scanner intput=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=intput.nextDouble(); } for (int i = 0; i < a.length; i++){ a[i]=a[i]+5; if(a[i]>=100){ a[i]=100; } System.out.println(a[i]); } } }