[英]Random numbers and bubble sort
我正在嘗試編寫一個小程序,該程序將允許用戶首先輸入9到18之間的數字,以生成相應的隨機數(代表半徑),然后計算每個隨機生成的數的表面(圓) ,最后按降序對結果進行排序。
到目前為止,這是我的代碼:
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;
}
}
您能給我一些提示嗎,因為我有點卡在這里。
由於int
您的程序將出現編譯錯誤- double
不一致
修改了程序以解決此問題,以及可能正在尋找的程序。
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開始,我正在使用受支持的自動裝箱功能
更新:更新了代碼以演示反向()
輸出:
輸入一個介於9到18之間的數字:
10
.......排序中.................
3.141592564
3.141592564
12.566370256
12.566370256
28.274333076
78.5398141
78.5398141
78.5398141
113.097332304
113.097332304
........................................................... ........逆轉.................
113.097332304
113.097332304
78.5398141
78.5398141
78.5398141
28.274333076
12.566370256
12.566370256
3.141592564
3.141592564
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