怎么数据类型用double就是对的，用float就是错的？
搞了我半天啊！题中有说明吗？一定要用double？？？
import java.io.*;
import java.util.StringTokenizer;
import java.math.*;

public class 围成面积{
  public final double PI = (double) Math.PI;
  public 围成面积() {
  }

  public void Start() throws Exception {
    BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
    String teststring = r.readLine();
    int q = 0;
    while (!teststring.equals("0 0 0 0")) {
      q++;
      StringTokenizer st = new StringTokenizer(teststring);
      String[] s1 = new String[4];
      int i = 0;
      while (st.hasMoreTokens()) {
        s1[i] = st.nextToken();
        i++;
      }
      double[] f = new double[4];
      for (int j = 0; j < 4; j++) {
        Double y1 = new Double(s1[j]);
        f[j] = y1.doubleValue();
      }
      double ra = 0f; //所得圆的半径
      double s = 0f; //绳子为成总面积
      double c = f[1] + f[2] + f[0]; //三角形边场
      double cosa = (f[1] * f[1] + f[2] * f[2] - f[0] * f[0]) / (2 * (f[1] * f[2]));
      double cosb = (f[0] * f[0] + f[2] * f[2] - f[1] * f[1]) / (2 * (f[0] * f[2]));
      double cosc = (f[1] * f[1] + f[0] * f[0] - f[2] * f[2]) / (2 * (f[1] * f[0]));
      double St = 0f; //三角形面积
      St = 0.5f * f[1] * f[2] * (double) Math.sin(Math.acos(cosa));
      double ri = 2 * St / (f[0] + f[1] + f[2]); // 内结缘半径
      double ci = 2 * PI * ri;
      if (f[3] <= ci) {
        ra = f[3] / (2 * PI);
        s = PI * ra * ra;
      }
      else {
        ra = 0.5f * (f[3] - c) /
            (double) (PI - 1 / Math.tan(0.5 * Math.acos(cosa)) -
                     1 / Math.tan(0.5 * Math.acos(cosb)) -
                     1 / Math.tan(0.5 * Math.acos(cosc)));
        s = PI * ra * ra + St -
            ra *
            ra*(double)(1 / Math.tan(0.5 * Math.acos(cosa)) +
               1 / Math.tan(0.5 * Math.acos(cosb)) +
               1 / Math.tan(0.5 * Math.acos(cosc)));
      }

      double temp0 = Math.round(100 * s);
      s = temp0 / 100;
      String ts = "" + s;
      int len = ts.length() - 1 - ts.indexOf(".");
      ts = "";
      for (int a = 2 - len; a > 0; a--) {
        ts = ts + "0";
      }
      System.out.println("Case " + q + ": " + s + ts);
      teststring = r.readLine();
    }
  }

  public static void main(String[] args) throws Exception {
    围成面积 t1 = new 围成面积();
    t1.Start();
  }

}

• Re:你这题它md扯蛋啊！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！1 (2546) kknd123 2005-02-06 18:42:37
  • Re:你这题它md扯蛋啊！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！1 (65) kknd123 2005-02-06 18:44:38
    • 编程习惯吧，做ACM (69) kicc 2005-02-07 01:36:44
      • Re:编程习惯吧，做ACM的题目我肯定用double。 (0) kicc 2005-02-07 01:37:13
        • 64位的保险一点 (0) sothink 2005-02-07 11:45:53