Palindromic+Squares

Palindromic Squares - Rob Kolstad
Palindromes are numbers that read the same forwards as backwards. The number 12321 is a typical palindrome.

Given a number base B (2 <= B <= 20 base 10), print all the integers N (1 <= N <= 300 base 10) such that the square of N is palindromic when expressed in base B; also print the value of that palindromic square. Use the letters 'A', 'B', and so on to represent the digits 10, 11, and so on.

Print both the number and its square in base B.

PROGRAM NAME: palsquare

INPUT FORMAT

A single line with B, the base (specified in base 10).

SAMPLE INPUT (file palsquare.in)

10

OUTPUT FORMAT

Lines with two integers represented in base B. The first integer is the number whose square is palindromic; the second integer is the square itself.

SAMPLE OUTPUT (file palsquare.out)

1 1

2 4

3 9

11 121

22 484

26 676

101 10201

111 12321

121 14641

202 40804

212 44944

264 69696

Source Code code format="java" /* ID: wjh3331 LANG: JAVA TASK: palsquare */

import java.io.*;

public class palsquare { public static final int MAX_BASE = 300;

public static void main(String[] args) throws IOException { BufferedReader in = new BufferedReader(new FileReader("palsquare.in")); PrintWriter out = new PrintWriter(new FileWriter("palsquare.out"));

int b = Integer.parseInt(in.readLine); // 진법

for(int i = 1; i <= MAX_BASE; i++) { int sqr = i * i; // 제곱한 값

String represent = Integer.toString(sqr, b).toUpperCase; // 진법 변환후 표현

// 회문 체크 boolean pal = true; for(int j = 0; j < represent.length / 2; j++) { if(represent.charAt(j) != represent.charAt(represent.length - j - 1)) { pal = false; }     }

// 회문이면 출력 if(pal) { out.println(Integer.toString(i, b).toUpperCase + " " + represent); }   }

out.close; System.exit(0); } } code

Comment 진법 변환을 직접 구현하지 않고 Integer 클래스를 이용해서... 왠지 나쁜짓 한거 같은 느낌이 드네요...