java经典编程题二及详细答案(6)

double area1 = triple.calcArea(); triple = new mianji(5.3, 6.2, 8); double area2 = triple.calcArea();

System.out.println(\三条边分别为3，4，5的三角形面积是: \ System.out.println(\三条边分别为5.3, 6.2, 8的三角形面积是: \ }

public double calcArea(){ double p = (a b c) / 2;

return Math.sqrt(p * (p - a) * (p- b) * (p - c)); } }

结果截图：

3）程序如下： import java.util.*; public class sushu {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in); System.out.print(\请输入一个整数:\ int x = scan.nextInt();

System.out.print(\请输入一个整数:\ int y = scan.nextInt(); int minNum = Math.min(x, y); int maxNum = Math.max(x, y);

System.out.println(\这两个整数间的素数有：\ for(int i=minNum, count =0; i

boolean isPrimeNumber = true; for(int j = 2; j < i; j ) {

if(i % j == 0) {

isPrimeNumber = false; } }

if(count == 3) {

System.out.println(); count = 0; }

if(isPrimeNumber) {

System.out.print(i \ count ; } } } }

结果截图：

? 提高题

1）程序如下： public class bahe {

// function:判断temp是否为素数 public boolean checkPrime(int temp){ boolean flag=true;

int i=(int)Math.sqrt(temp); for(int j=2;j<=i;j ){ if(temp%j!=0){ continue;

}else{ flag=false; j=i 1; } }

return flag; }

//function:将temp分解为两个素数之和并打印 public void ChangeInt(int temp){ int i=(int)(temp/2); for(int j=2;j<=i;j ){ if(checkPrime(j)){ int k=temp-j; if(checkPrime(k)){

System.out.println(\整数temp\被分解为素数\和素数\之和\ break; } }else{ continue; } } }

public static void main(String []args){ bahe ch=new bahe(); for(int i=6;i<=20;i=i 2){ ch.ChangeInt(i); } } }

结果截图：

2）程序如下： import java.util.*; public class Ex1 {

public static void gongYue(int m, int n) {

if (m > n) {

int h = m; m = n; n = h; }

if (n % m == 0)

{System.out.println(\最大公约数为：\ else {

for (int i = n / 2; i > 1; i--) {

if (m % i == 0 && n % i == 0) {

System.out.println(\最大公约数为：\ break; } } } }

public static void gongBei(int m, int n) {

if (m > n) {

int h = m; m = n; n = h; }

for (int j = n; j <= m* n; j ) {

if (j % m == 0 && j % n == 0) {

System.out.println(\最小公倍数：\ break; } } }

public static void main(String[] args) {

Scanner scan = new Scanner(System.in); System.out.print(\请输入一个整数：x=\ int x = scan.nextInt();

System.out.print(\请输入一个整数：y=\ int y = scan.nextInt(); gongYue(x, y); gongBei(x, y); } }

结果截图：

实验2.5

? 基本题