java第七次作业
- 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 work; public class work { public static void main(String[] args) { int []a=new int[]{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 work; import java.util.Scanner; public class work { public static void main(String[] args) { Scanner input=new Scanner(System.in); 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 work; import java.util.Scanner; public class work { public static void main(String[] args) { String []a=new String[]{"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 work; import java.util.Scanner; public class work { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("输入5名学生的成绩"); float sum=0; int[] a = new int[5]; for (int i = 0; i < 5; i++) { a[i] = input.nextInt(); sum+=a[i]; } System.out.println("总分是:"+sum); System.out.println("平均分是:"+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(for)
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出(for) package work; public class work { public static void main(String[] args) { int []a=new int[]{12,53,23,44,53}; for (int i = 0; i < 5; i++) { System.out.print(" "+a[i]); } System.out.println(); for (int i = 4; i >= 0; i--) { System.out.print(" "+a[i]); } } }
作业:
- 定义一个长度为10的整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数
package work; import java.util.Scanner; public class work { public static void main(String[] args) { int s=0,d=0; int []a=new int[10]; Scanner input=new Scanner(System.in); System.out.println("输入10个数"); for (int i = 0; i < 10; i++) { a[i]=input.nextInt(); if (a[i]%2==0) { s++; } else { d++; } } System.out.println("奇数"+d); System.out.println("偶数"+s); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package work; public class work { public static void main(String[] args) { int []a=new int[100]; for (int i = 0; i < 100; i++) { a[i]=i+1; System.out.print(" "+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 work; import java.util.Scanner; public class work { public static void main(String[] args) { double []a=new double[10]; Scanner input=new Scanner(System.in); System.out.println("输入10名同学的成绩"); for (int i = 0; i < 10; i++) { a[i]=input.nextInt(); while (a[i]>100||a[i]<0) { System.out.println("错误,重新输入");; a[i]=input.nextInt(); } a[i]+=5; if (a[i]>100) { a[i]=100; } } for (int i = 0; i < 10 ; i++) { System.out.print(" "+a[i]); } } }
- 定义一个长度为10的整型数组,赋值(动态静态都可以)后求出奇数个数和偶数个数