[英]Random numbers and bubble sort
我正在尝试编写一个小程序,该程序将允许用户首先输入9到18之间的数字,以生成相应的随机数(代表半径),然后计算每个随机生成的数的表面(圆) ,最后按降序对结果进行排序。
到目前为止,这是我的代码:
import java.util.Scanner;
import java.math.*;
public class test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter a number from 9 to 18: ");
int num9a18 = input.nextInt();
if (num9a18 < 9 || num9a18 > 18) {
System.out.println("This number is invalid!");
}
int num;
for (int i = 0; i < num9a18; i++) {
num = randomInt(1, 6);
System.out.print(num + " ");
}
}
public static int randomInt(int small, int big) {
double PI = 3.141592564;
int results = ((int) (Math.random() * (big - small + 1)) + small);
return results*results*PI;
}
}
您能给我一些提示吗,因为我有点卡在这里。
由于int
您的程序将出现编译错误- double
不一致
修改了程序以解决此问题,以及可能正在寻找的程序。
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter a number from 9 to 18: ");
int num9a18 = input.nextInt();
if (num9a18 < 9 || num9a18 > 18) {
System.out.println("This number is invalid!");
}
double result;
List<Double> results = new ArrayList<Double>();
for (int i = 0; i < num9a18; i++) {
result = resultFromRandomRadius(1, 6);
results.add(result);
}
System.out.println("................SORTING.................");
Collections.sort(results);
for (double res : results) {
System.out.println(res);
}
System.out.println("..........................................");
System.out.println("................REVERSING.................");
Collections.reverse(results);
for (double res : results) {
System.out.println(res);
}
}
public static double resultFromRandomRadius(int small, int big) {
double PI = 3.141592564;
int results = ((int) (Math.random() * (big - small + 1)) + small);
return results * results * PI;
}
}
注意:自Java 1.5开始,我正在使用受支持的自动装箱功能
更新:更新了代码以演示反向()
输出:
输入一个介于9到18之间的数字:
10
.......排序中.................
3.141592564
3.141592564
12.566370256
12.566370256
28.274333076
78.5398141
78.5398141
78.5398141
113.097332304
113.097332304
........................................................... ........逆转.................
113.097332304
113.097332304
78.5398141
78.5398141
78.5398141
28.274333076
12.566370256
12.566370256
3.141592564
3.141592564
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