Calculator: error No such file or directory, skipped frames

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I am making calculator but after launch, when i press any of button (0,1,2 etc) of calculator. i get unfortunately calculator stopped working. In logcat get errors.. where am i lacking??

CODE:

package com.example.calculator;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Calculator extends Activity implements OnClickListener {

    String initialnum="0";
    TextView textview;
    char operator=' ';
    int result;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calculator);

        TextView textview= (TextView) findViewById(R.id.textView1);
        textview.setText("0");


        ((Button) findViewById(R.id.button00)).setOnClickListener(this);
        ((Button) findViewById(R.id.button01)).setOnClickListener(this);
        ((Button) findViewById(R.id.button02)).setOnClickListener(this);
        ((Button) findViewById(R.id.button03)).setOnClickListener(this);
        ((Button) findViewById(R.id.button04)).setOnClickListener(this);
        ((Button) findViewById(R.id.button05)).setOnClickListener(this);
        ((Button) findViewById(R.id.button06)).setOnClickListener(this);
        ((Button) findViewById(R.id.button07)).setOnClickListener(this);
        ((Button) findViewById(R.id.button08)).setOnClickListener(this);
        ((Button) findViewById(R.id.button09)).setOnClickListener(this);            
        ((Button) findViewById(R.id.buttonc)).setOnClickListener(this);
        ((Button) findViewById(R.id.buttondivide)).setOnClickListener(this);
        ((Button) findViewById(R.id.buttonequal)).setOnClickListener(this);
        ((Button) findViewById(R.id.buttonminus)).setOnClickListener(this);
        ((Button) findViewById(R.id.buttonmultiply)).setOnClickListener(this);
        ((Button) findViewById(R.id.buttonplus)).setOnClickListener(this);

    }
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {

        case R.id.button00:
        case R.id.button01:
        case R.id.button02:
        case R.id.button03: 
        case R.id.button04:
        case R.id.button05:
        case R.id.button06:
        case R.id.button07:
        case R.id.button08:
        case R.id.button09: 

        String digit= ((Button) v).getText().toString();
        if (initialnum.equals("0")) {
            initialnum= digit;      
        } else {
            initialnum +=digit;
        } 
        textview.setText(initialnum);

        if (operator == '=') {
            result= 0;
            operator=' ';
        } break;

        case R.id.buttonc:
            result=0;
            operator=' ';

        case R.id.buttondivide:
            compute();
            operator='/';
            break;

        case R.id.buttonminus:
            compute();
            operator='-';
            break;

        case R.id.buttonmultiply:
            compute();
            operator='*';
            break;

        case R.id.buttonplus:
            compute();
            operator='+';
            break;

        case R.id.buttonequal:
            compute();
            operator='=';
            break;
        }

    }

    private void compute() {
        int number= Integer.parseInt(initialnum);
        // TODO Auto-generated method stub
        if (operator==' ') {
            result= number;
        } else if (operator=='+') {
            result+= number;
        }else if (operator=='-') {
            result-= number;
        }else if (operator=='*') {
            result*= number;
        } else if (operator=='/') {
            result/= number;                
            }
        textview.setText(result);
        }

}

ERROR LOG:

03-05 13:10:52.539: E/Trace(805): error opening trace file: No such file or directory (2)
03-05 13:10:53.359: I/Choreographer(805): Skipped 55 frames!  The application may be doing too much work on its main thread.
03-05 13:10:53.399: D/gralloc_goldfish(805): Emulator without GPU emulation detected.
03-05 13:14:46.659: D/AndroidRuntime(805): Shutting down VM
03-05 13:14:46.669: W/dalvikvm(805): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
03-05 13:14:46.699: E/AndroidRuntime(805): FATAL EXCEPTION: main
03-05 13:14:46.699: E/AndroidRuntime(805): java.lang.NullPointerException
03-05 13:14:46.699: E/AndroidRuntime(805):  at com.example.calculator.Calculator.onClick(Calculator.java:64)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.view.View.performClick(View.java:4084)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.view.View$PerformClick.run(View.java:16966)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.os.Handler.handleCallback(Handler.java:615)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.os.Looper.loop(Looper.java:137)
03-05 13:14:46.699: E/AndroidRuntime(805):  at android.app.ActivityThread.main(ActivityThread.java:4745)
03-05 13:14:46.699: E/AndroidRuntime(805):  at java.lang.reflect.Method.invokeNative(Native Method)
03-05 13:14:46.699: E/AndroidRuntime(805):  at java.lang.reflect.Method.invoke(Method.java:511)
03-05 13:14:46.699: E/AndroidRuntime(805):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-05 13:14:46.699: E/AndroidRuntime(805):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-05 13:14:46.699: E/AndroidRuntime(805):  at dalvik.system.NativeStart.main(Native Method)

asked 52 secs ago

user3382417

1