thinking in java课后习题-vampire numbers

最新推荐文章于 2025-04-26 16:05:24 发布

jep1983

最新推荐文章于 2025-04-26 16:05:24 发布

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分类专栏：读书笔记文章标签： java

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本文介绍了一个使用Java编写的简单程序，该程序用于找出所有两位数相乘得到的四位数‘吸血鬼数’。吸血鬼数是指一个数能分解成两个数的乘积，并且这两个数恰好包含原始数的所有数字，且各数字出现次数相同。

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import java.applet.*;
import java.awt.*;

@SuppressWarnings("serial")
public class Vampire extends Applet {
  private int num1, num2, product;
  private int[] startDigit = new int[4];
  private int[] productDigit = new int[4];
  private int count = 0;
  private int vampCount = 0;
  private int x, y;

  public void paint(Graphics g) {
    g.drawString("Vampire Numbers", 10, 20);
    g.drawLine(10, 22, 150, 22);
    // Positioning for output to applet:
    int column = 10, row = 35;
    for (num1 = 10; num1 <= 99; num1++)
      for (num2 = 10; num2 <= 99; num2++) {
        product = num1 * num2;
        startDigit[0] = num1 / 10;
        startDigit[1] = num1 % 10;
        startDigit[2] = num2 / 10;
        startDigit[3] = num2 % 10;
        productDigit[0] = product / 1000;
        productDigit[1] = (product % 1000) / 100;
        productDigit[2] = product % 1000 % 100 / 10;
        productDigit[3] = product % 1000 % 100 % 10;
        count = 0;
        for (x = 0; x < 4; x++)
          for (y = 0; y < 4; y++) {
            if (productDigit[x] == startDigit[y]) {
              count++;
              productDigit[x] = -1;
              startDigit[y] = -2;
              if (count == 4) {
                vampCount++;
                int a = (int) Math.random() * 100;
                int b = (int) Math.random() * 100;
                int c = (int) Math.random() * 100;
                if (vampCount < 10) {
                  g.drawString("Vampire number   " + vampCount + " is " + num1
                      + " * " + num2 + " = " + product, column, row);
                  row += 20;
                } else {
                  g.drawString("Vampire number  " + vampCount + " is " + num1
                      + " * " + num2 + " = " + product, column, row);
                  row += 20;
                }
              }
            }
          }
      }
  }
} // /:~