Java第七次作业
上机作业:
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。
public class cxz { /** * @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 <= 4; 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。
import java.util.Scanner; public class cxz { /** * @param args */ 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 <= 4; i++) { a[i] = input.nextInt(); } for (int j = 0; j <= 4; j++) { System.out.println(a[j]); } } }
3.定义字符型数组,分别存储c、h、 i、n、a 并在控制台输出
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub String[] a = { "c", "h", "i", "n", "a" }; Scanner input = new Scanner(System.in); for (int j = 0; j <= 4; j++) { System.out.println(a[j]); } } }
4.输入5个学生成绩,求总分和平均分
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = new int[5]; double p = 0; int sum = 0; Scanner input = new Scanner(System.in); for (int i = 0; i <= 4; i++) { a[i] = input.nextInt(); for (int y = 0; y < 1;) { if (a[i] > 100 | a[i] < 0) { System.out.println("输入错误重新输入"); a[i] = input.nextInt(); } if (a[i] >= 0 & a[i] <= 100) { break; } } } for (int j = 0; j <= 4; j++) { sum += a[j]; } p = sum / 5.0; System.out.println("总分为" + sum + "," + "平均分为" + p); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出(for)
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = { 12, 53, 23, 44, 53 }; Scanner input = new Scanner(System.in); for (int i = 0; i <= 4; i++) { System.out.print(" "); System.out.print(a[i]); } System.out.println(); for (int i : a) { System.out.print(" "); System.out.print(i); } System.out.println(); for (int j = 4; j >= 0; j--) { System.out.print(" "); System.out.print(a[j]); } } }
作业:
1.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
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a =new int[10]; int x=0,y=0; Scanner input = new Scanner(System.in); for (int i = 0; i <= 9; i++) { a[i]=input.nextInt(); } for(int j=0;j<=9;j++){ if(a[j]%2==0){ x++; } if(a[j]%2!=0){ y++; } } System.out.println("奇数个数为"+y+","+"偶数个数为"+x); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = new int[100]; int x = 0, y = 0; Scanner input = new Scanner(System.in); for (int i = 0; i <= 99; i++) { a[i] = i + 1; } for (int j = 0; j <= 99; j++) { System.out.println(a[j]); } } }
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。
import java.util.Scanner; public class cxz { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub double[] a = new double[10]; Scanner input = new Scanner(System.in); for (int i = 0; i <= 9; i++) { a[i] = input.nextDouble(); for (int y = 0; y < 1;) { if (a[i] > 100 | a[i] < 0) { System.out.println("输入错误重新输入"); a[i] = input.nextDouble(); } if (a[i] >= 0 & a[i] <= 100) { break; } } } for (int j = 0; j <= 9; j++) { a[j] += 5; if (a[j] > 100) { a[j] = 100; } System.out.println(a[j]); } } }