考试小程序

}
}
}
执行环境类
Cicle.java
public class Circle implements CalculateArea {
double r;
public Circle(double r) {
this.r= r;
}
public double getArea() {
return Math.PI * r * r;
for (int i = 1; i < n; i++) {//第2到第n个数
data[i] = data[i - 1] * 10 + 1;
sum = sum + data[i];//累加求和
}
return sum;
}
//计算n之内的完美数。完美数是指真因子（即除了自身以外的约数）的和等于它本身的数字。如6的真因子有1、2、3，而6=1+2+3,故6是完美数。
return -1;
}
}
}
return c;
}
}
Triangle,java
public class Triangle implements CalculateArea {
double a, b, c;
public Triangle(double a, double b, double c) {
this.a = a;
this.b = b;
if (gewei * gewei * gewei + shiwei * shiwei * shiwei + baiwei * baiwei * baiwei == i) {
System.out.println(i);
}
}}Leabharlann //计算f(n)=1+11+111+……+111...111(n个1)[对于1<=n<=10成立即可]
this.height = height;
}
double getVolume() {
return bottomCircle.getArea() * height;
}
}
Rect.java
public class Rect implements CalculateArea {
double width, height;
if (Math.abs(i - n) + Math.abs(j - n) == n - 1) {//如果一个点与菱形中点的横纵坐标差的绝对值的和小于n-1，则该点位于菱形内部，应该打印
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();//换行
if (i % j == 0) {//能整除的即为银子
sum += j;
}
}
if (sum == i) {//判断是否是完美数
System.out.println(i);
}
}
}
//打印10个n之内（不包含n）的随机奇数，并计算打印它们的和
public void randomOdds(int n) {
return Math.sqrt(s * (s - a) * (s - b) * (s - c));
} else {
System.out.println("This is not a Triangle, and the area can not be calculated. return -1!");
System.out.println("10个" + n + "之内的随机奇数：");
Random random = new Random();
int i = 1;//计数器，用来控制打印出的数字个数
int sum = 0;
while (i <= 10) {
int k = random.nextInt(n);//产生0(含)——n(不含)的随机数
//打印机n之内的勾股数
public void gouGuShu(int n) {
System.out.println(n + "之内的勾股数有：");
for (int i = 3; i <= n; i++) {//最短边，因为最小的勾股数是3、4、5，所以这里取3
for (int j = i; j <= n; j++) {//第二短边（不短于最短边）
public void shuiXianHuaShu() {
System.out.println("三位水仙花数：");
for (int i = 100; i < 1000; i++) {
int gewei = i % 10;//各位
int shiwei = i / 10 % 10;//十位
int baiwei = i / 100;//百位
public int qiuHe(int n) {
System.out.println("数字求和：");
int[] data = new int[n];//第n个位置存储数字111...111(n个1)
data[0] = 1;//第一个数1
int sum = data[0];//和，先把第一个数加上
public void wanMeiShu(int n) {
System.out.println(n + "之内的完美数：");
for (int i = 6; i <= n; i++) {//6是最小的完美数
int sum = 0;//和
for (int j = 1; j <= i / 2; j++) {//真因子不会大于该数的一半
public void lingXing(int n) {
System.out.println("打印边长为" + n + "的菱形");
for (int i = 1; i <= 2 * n - 1; i++) {
for (int j = 1; j <= 2 * n - 1; j++) {//打印1行
public Rect(double width, double height) {
this.width = width;
this.height = height;
}
@Override
public double getArea() {
return width * height;
}
}
RightangledTriangle.java
public class RightangledTriangle extends Triangle {
public RightangledTriangle(double a, double b) {
super(a, b, Math.sqrt(a * a + b * b));
}
public double getChord() {
for (int k = j + 1; k <=n; k++) {//最长边（比第二短边要长）
if (i * i + j * j == k * k) {
System.out.println(i + " " + j + " " + k);
}
}
}
}
}
//三位数水仙花数（水仙花数是指一个n位数( n≥3 )，它的每个位上的数字的n次幂之和等于它本身。）
if (k % 2 == 1) {//k是奇数才处理，否则继续while循环，直到生成奇数
System.out.println("第" + i + "个数: " + k);
sum += k;
i++;
}
}
System.out.println("上面10个数的和为：" + sum);
}
//输出一个边长为n的菱形
}
}
Column.class
public class Column {
Circle bottomCircle;
double height;
public Column(Circle bottomCircle, double height) {
this.bottomCircle =bottomCircle;
this.c = c;
}
boolean isTriangle() {
return a + b > c && a + c > b && b + c > a;
}
public double getArea() {
if (isTriangle()) {
doubles = (a + b + c) / 2.0;