Java第七周作业
上机练习:
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 Work; public class Work1 { /** * @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 < 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 Work; import java.util.Scanner; public class Work2 { /** * @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 < a.length; i++) { System.out.println("请输入第"+(i+1)+"个赋值"); a[i]=input.nextInt(); } for(int i=0;i< a.length; i++) { System.out.println("第"+(i+1)+"个赋值"+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; public class Work3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub char a[]={'c','h','n','a'}; for(char i:a){ System.out.println(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 Work4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int sum=0; double pj; 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]; } pj=sum/5; System.out.println(sum); System.out.println(pj); } }
5.定义数组{12,53,23,44,53} 用for和foreach分别输出,再倒序输出
public class Work5 { /** * @param args */ 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("正序输出为" + a[i]); } System.out.println("foreach输出"); for (int i : a) { System.out.println("正序输出为" + i); } System.out.println("for倒叙输出"); for (int i = a.length - 1; i >= 0; i--) { System.out.println("倒叙输出为" + a[i]); } } }
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 Homework; import java.util.Scanner; public class Homework1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int[] a = new int[10]; int js = 0; int os = 0; Scanner input = new Scanner(System.in); for (int i = 0; i < a.length; i++) { System.out.println("请输入第" + (i + 1) + "个数"); a[i] = input.nextInt(); } for (int i = 0; i < a.length; i++) { if (a[i] % 2 == 1) js += 1; else os++; } System.out.println("奇数个数为" + js + "偶数个数为" + os); } }
2.生成一个100长度数组,里面的数分别是1-100,并输出
package Homework; import java.util.Scanner; public class Home2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int []a=new int[100]; for (int i = 0; i < a.length; i++) { a[i]=i+1; System.out.println(a[i]); } } }
2.定义一个数组,求数组中的最大值和最小值
package Homework; import java.util.Scanner; public class Home2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int[] a = new int[10]; System.out.println("请任意输入10个数"); for (int i = 0; i < a.length; i++) { a[i] = input.nextInt(); } int max = a[0]; int min = a[0]; for (int i = 0; i < a.length; i++) { if (a[i] > max) { max = a[i]; } if (a[i] < min) { min = a[i]; } } System.out.println("数组中的最大值:" + max); System.out.println("数组中的最小值:" + min); } }
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 Class; import java.util.Scanner; public class Exe3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入10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("加分后的成绩为:"); for (int i = 0; i < a.length; i++) { if (a[i] < 0 || a[i] > 100) { System.out.println("输入错误,请重新输入"); a[i] = input.nextDouble(); } a[i] += 5; if (a[i] > 100) { a[i] = 100; } System.out.println(a[i]); } } }