數學動態繪圖軟體Geogebra

剛好最近弄三角函數需要
找到此一方便好用的數學動態繪圖軟體 Geogebra
重點是免費 + 跨平台
https://sites.google.com/a/ymsh.tp.edu.tw/geogebra/

[Android]BMI

package kevin.demo;

import java.math.BigDecimal;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class BMIActivity extends Activity implements OnClickListener

{

private TextView txtResult;

private EditText edtWeight;

private EditText edtHeight;

private Button btnGo;

private TextView txtScale;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) 

    {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

       

        txtResult = (TextView)findViewById(R.id.txtResult);

        txtScale = (TextView)findViewById(R.id.txtScale);

        edtHeight = (EditText)findViewById(R.id.edtHeight);

        edtWeight = (EditText)findViewById(R.id.edtWeight);

        btnGo = (Button)findViewById(R.id.btnGo);

        

        btnGo.setOnClickListener(this);

        

    }

public void onClick(View v) 

{

// TODO Auto-generated method stub

if(v.equals(btnGo))

{

float W,H,BMI;

W = Float.parseFloat(edtWeight.getText().toString());

H = Float.parseFloat(edtHeight.getText().toString());

H = H / 100;

BMI = W / (H*H);

BigDecimal  Get  =  new  BigDecimal(BMI);  

float  Result  =  Get.setScale(2,  BigDecimal.ROUND_HALF_UP).floatValue();  

//四捨五入並保留兩位小數

txtResult.setText("您的BMI: "+Float.toString(Result));

if(BMI < 18.5)

{

//體重過輕

txtScale.setText("體重過輕");

}

else if((BMI >= 18.5)&&(BMI < 24))

{

//正常範圍

txtScale.setText("正常範圍");

}

else if((BMI >= 24)&&(BMI < 27))

{

//過重

txtScale.setText("體重過重");

}

else if((BMI >= 27)&&(BMI < 30))

{

//輕度肥胖

txtScale.setText("輕度肥胖");

}

else if((BMI >= 30)&&(BMI < 35))

{

//中度肥胖

txtScale.setText("中度肥胖");

}

else if(BMI >= 35)

{

//重度肥胖

txtScale.setText("重度肥胖");

}

}

}

}

APK檔：https://dl.dropbox.com/u/7806508/APK/BMI%20V1.0.apk
完整專案：https://dl.dropbox.com/u/7806508/Android%20App/BMI%20V1.0.rar