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 task; import java.util.Iterator; public class T1 { 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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { // TODO Auto-generated method stub int a[]=new int[5]; Scanner input=new Scanner(System.in); 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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { 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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { // TODO Auto-generated method stub int sum=0; int p=0; int a[]=new int[5]; Scanner input=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); } for (int i = 0; i < a.length; i++) { sum+=a[i]; } System.out.println(sum); 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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { int a[]= {12,53,23,44,53}; for (int j = 0; j < 5; j++) { System.out.print(","+a[j]); } System.out.println(); for (int j = 4; j >= 0; j--) { System.out.print(","+a[j]); } } }
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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { int b=0; int c=0; int a[]= {12,53,23,44,53}; for (int j = 0; j < 5; j++) { if (a[j]%2==0) { b++; } else { c++; } } System.out.println("奇数有"+c+"个"); System.out.println("偶数有"+b+"个"); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { int []a=new int[100]; for (int i = 0; i < 100; 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 task; import java.util.Iterator; import java.util.Scanner; public class T1 { public static void main(String[] args) { int a[]=new int[10]; Scanner input=new Scanner(System.in); for (int i = 0; i < a.length; i++) { a[i]=input.nextInt(); if (a[i]>100||a[i]<0) { System.out.println("从新输入"); a[i]=input.nextInt(); } } for (int i = 0; i < a.length; i++) { if (a[i]>96) { System.out.println(100); } else{ System.out.println(a[i]+5); } } } }