java7次
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。
1 package exp_001; 2 3 public class num_org_001 { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 int a[]=new int[]{10,20,30,40,50}; 8 for (int i : a) { 9 System.out.println(i); 10 } 11 } 12 13 }
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。
1 package exp_001; 2 3 import java.util.Scanner; 4 5 public class num_org_002 { 6 7 public static void main(String[] args) { 8 // TODO Auto-generated method stub 9 Scanner input=new Scanner(System.in); 10 System.out.println("请为数组赋值（5）个"); 11 int a[]=new int [5]; 12 for (int i = 0; i < a.length; i++) { 13 a[i]=input.nextInt(); 14 } 15 for (int i : a) { 16 System.out.println(i); 17 } 18 19 } 20 21 }
3.定义字符型数组，分别存储c、h、 i、n、a 并在控制台输出
1 package exp_001; 2 3 public class num_org_003 { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 String ch[]=new String[]{"C","h","i","n","a"}; 8 for (String string : ch) { 9 System.out.print(string); 10 } 11 } 12 }
4.输入5个学生成绩，求总分和平均分
1 package exp_001; 2 3 import java.util.Scanner; 4 5 public class num_org_004 { 6 7 public static void main(String[] args) { 8 // TODO Auto-generated method stub 9 Scanner input=new Scanner(System.in); 10 System.out.println("输入5个学生成绩"); 11 int sum=0; 12 double ave=0; 13 int sc[]=new int[5]; 14 for (int i = 0; i < sc.length; i++) { 15 sc[i]=input.nextInt(); 16 } 17 for (int i : sc) { 18 sum+=i; 19 } 20 ave=sum/5.0; 21 System.out.println("总分"+sum+"平均分"+ave); 22 } 23 24 }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出，再倒序输出
1 package exp_001; 2 3 public class num_org_005 { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 int a[]=new int[]{12,53,23,44,53}; 8 System.out.println("for"); 9 for (int i = 0; i < a.length; i++) { 10 System.out.print(a[i]+" "); 11 } 12 System.out.println("\nforeach"); 13 for (int i : a) { 14 System.out.print(i+" "); 15 } 16 System.out.println("\n倒序输出"); 17 for (int i = a.length-1; i>-1; i--) { 18 System.out.print(a[i]+" "); 19 } 20 } 21 22 }
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
1 package exp_001; 2 3 import java.util.Scanner; 4 5 public class num_work_001 { 6 7 public static void main(String[] args) { 8 // TODO Auto-generated method stub 9 Scanner input=new Scanner(System.in); 10 System.out.println("请为数组赋值(8个数)"); 11 int a=0; 12 int b=0; 13 int c=0; 14 int num[]=new int[8]; 15 for (int i = 0; i < num.length; i++) { 16 num[i]=input.nextInt(); 17 } 18 for (int i = 0; i < num.length; i++) { 19 if(num[i]%2==0) { 20 a++; 21 } 22 else { 23 b++; 24 } 25 } 26 System.out.println("奇数个数"+a+"偶数个数"+b); 27 } 28 29 }
2.定义一个数组，求数组中的最大值和最小值
1 package exp_001; 2 3 public class num_work_002 { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 System.out.println("数组最值（10，20，30，40，50）\n求最大值和最小值"); 8 int a[]=new int[]{10,20,30,40,50}; 9 int max=a[0]; 10 int min=a[0]; 11 for (int i : a) { 12 if(i>max) { 13 max=i; 14 } 15 if(i<min) { 16 min=i; 17 } 18 } 19 System.out.println("最大值"+max+ "最小值"+min); 20 } 21 22 23 }
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。
1 package exp_001; 2 3 import java.util.Scanner; 4 5 public class num_work_003 { 6 7 public static void main(String[] args) { 8 // TODO Auto-generated method stub 9 Scanner input=new Scanner(System.in); 10 System.out.println("输入10个学生成绩[0,100]"); 11 int sco[]=new int[10]; 12 for (int i = 0; i < sco.length; i++) { 13 sco[i]=input.nextInt(); 14 } 15 System.out.println("加分后的成绩"); 16 for (int i : sco) { 17 if(i>=95) { 18 System.out.print("100 "); 19 } 20 else { 21 System.out.print(i+5+" "); 22 } 23 } 24 } 25 26 }
