Question

java 编程，比较初级，但还是请大家帮助一下，因为这个作业对我很重要

写一个程序判断输入的参数是否能被开根号成一个整数，如1，64，81，100...
具体要求：
用scanner输入参数
main()里包含一个loop
输入参数如果是-1则停止运行程序
建议采用public static boolean isPerfectSquare(int input)为其中一条
感谢大家帮助

Answer 1

/**
* @param args
*/
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Perfect Square Identifier (enter -1 to quite)");
String str = "0";
double tmp = 0.0;
Pattern pattern = Pattern.compile(".*?(\\.)(0)");
do {
System.out.print("Please enter a number:");
str = scanner.next();
try {
double inputNum = Double.parseDouble(str);
tmp = Math.sqrt(inputNum);
if (!pattern.matcher(tmp+"").matches())
System.out.println(str + " is not a Perfect Square.");
else
System.out.println(str + " is a Perfect Square.");
} catch (Exception e) {
System.out.println("[ERROR] Please enter a number :");
}

} while (!str.trim().equals("-1"));
System.out.println("GoodBye. :)\n" + "End of processing...");
}
加分吧，特意给你写的。

追问

我觉得你写的很好很简明，完全是我需要的，麻烦你再给我看另外一个作业，用这种简明的方法，谢谢你了
标题是
java 语言，请各位帮忙解决，我觉得很困难
作者名字是我名字，你在这个贴子里就能找到，谢谢

Answer 2

package ifPerfectNum;

import java.util.Scanner;

public class IFPerfectSquare {

/**
* @param args
*/
public static void main(String[] args) {
System.out.println("Perfect Square Identifier (enter -1 to quite)");
System.out.print("Please enter a number: ");
Scanner scanner = new Scanner(System.in);
int input = scanner.nextInt();
// loop judgement
boolean ifPerfectSquare = isPerfectSquare(input);
while (true) {
if (input != -1) {
if (ifPerfectSquare) {
System.out.println(input + " is a Perfect Square: ");
} else {
System.out.println(input + " is not a Perfect Square: ");
}
System.out.print("Perfect enter a number: ");
Scanner scannerLoop = new Scanner(System.in);
input = scannerLoop.nextInt();
ifPerfectSquare = isPerfectSquare(input);
} else {
break;
}
}
System.out.println("Goodbye. :)");
System.out.println("End of processing...");
// delay 5 seconds
new Thread() {
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
System.out.print("process is over.");
}

/**
* @param input
* @return value of boolean
*/
public static boolean isPerfectSquare(int input) {
boolean returnValue = false;
if (input == -1) {
return returnValue;
}
Double sqrtedNum = Math.sqrt(input);
String sqrtedNumToString = String.valueOf(sqrtedNum);
String sqrtedNumToStringCut = sqrtedNumToString
.substring(sqrtedNumToString.indexOf(".") + 1);
if (sqrtedNumToStringCut.equals("0")) {
returnValue = true;
}
return returnValue;
}
}