Help in android app developing - Android Q&A, Help & Troubleshooting

Please Can Someone help me to get hands on the error in this source code for 2 subjects gpa calculator as it is giving me Force Close
Here`s the source code
"
package com.gado.e001;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends Activity {
RadioButton gradea1, gradeb1, gradec1, graded1, gradea2, gradeb2, gradec2,
graded2;
EditText hours1, hours2;
Button calc;
float fgrade1, fgrade2, fhours1, fhours2;
float Result = fgrade1 + fgrade2 + fhours1 + fhours2;
public void Identify() {
gradea1 = (RadioButton) findViewById(R.id.radioButton1);
gradeb1 = (RadioButton) findViewById(R.id.radioButton2);
gradec1 = (RadioButton) findViewById(R.id.radioButton3);
graded1 = (RadioButton) findViewById(R.id.radioButton4);
gradea2 = (RadioButton) findViewById(R.id.radioButton5);
gradeb2 = (RadioButton) findViewById(R.id.radioButton6);
gradec2 = (RadioButton) findViewById(R.id.radioButton7);
graded2 = (RadioButton) findViewById(R.id.radioButton8);
hours1 = (EditText) findViewById(R.id.editText1);
hours2 = (EditText) findViewById(R.id.editText2);
calc = (Button) findViewById(R.id.button1);
}
public void getting() {
gradea1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade1 = 4f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
gradeb1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade1 = 3f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
gradec1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade1 = 2f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
graded1.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade1 = 1f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
gradea2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade2 = 4f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
gradeb2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade2 = 3f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
gradec2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade2 = 2f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
graded2.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
fgrade2 = 1f;
}
else{
Toast.makeText(getBaseContext(), "", Toast.LENGTH_SHORT).show();
}
}
});
fhours1 = Float.parseFloat(hours1.getText().toString());
fhours2 = Float.parseFloat(hours2.getText().toString());
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
calc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Identify();
getting();
Toast.makeText(getBaseContext(), "" + Result, Toast.LENGTH_LONG)
.show();
}
});
}
}
"
Please Help Me

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You might be better off asking this question on Stackoverflow.

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Run your app with your phone connected to your PC and Eclipse running, this way Eclipse will show you the error so you can tell us what is it.