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 abc; public class abc { 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 abc; import java.util.Scanner; public class abc { 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(); 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 abc; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub char[] a = { 'c', 'h', 'i', 'n', 'a' }; for (int j = 0; j < a.length; j++) { System.out.println(a[j]); } } }
4.输入5个学生成绩,求总分和平均分
package abc; import java.util.Scanner; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub int[] a = new int[5]; int sum = 0; Scanner input = new Scanner(System.in); for (int i = 0; i < a.length; 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
package abc; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub int a[] = { 12, 53, 23, 44, 53 }; System.out.println("for输出"); for (int i = 0; i < a.length; i++) { System.out.println(a[i]); } System.out.println("foreach输出"); for (int i : a) { System.out.println(i); } System.out.println("倒序输出"); for (int i = a.length - 1; i >= 0; i--) { System.out.println(a[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 abc; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub int a[]={1,2,3,4,5}; int b=0; int c=0; for (int i = 0; i < a.length; i++) { if (a[i]%2!=0) { b++; } else{ c++; } } System.out.println("奇数个数"+b); System.out.println("偶数个数"+c); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package abc; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub int[] a = new int[1]; for (int i = 0; i < a.length; i++) { for (int j = 1; j <= 100; j++) { a[i] = j; System.out.println("数是" + 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 abc; import java.util.Scanner; public class abc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入十个学生成绩"); double a[] = new double[10]; for (int i = 0; i < a.length; i++) { a[i] = input.nextDouble(); } System.out.println("加分后成绩"); for (int i = 0; i < a.length; i++) { a[i] = a[i] + 5; if (a[i] > 100) { System.out.println(a[i] = 100); } else { System.out.println(a[i]); } } } }