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Articles on Trending Technologies
Technical articles with clear explanations and examples
Area of a n-sided regular polygon with given Radius?
Here we will see how to get the area of an n-sided regular polygon whose radius is given. Here the radius is the distance from the center of any vertex. To solve this problem, we have drawn one perpendicular from the center to one side. Let each side is of length ‘a’. The perpendicular is dividing the side into two parts. The length of each part is a/2. The perpendicular and one radius is making an angle x. Let the length of the radius is h.Here we can see that the polygon is divided into N equal triangles. So for ...
Read MoreArea of a leaf inside a square?
Here we will see how to get the area of a leaf-like below, which is present inside the square ABCD. Each side of the square is of length ‘a’.The leaf has two equal parts. Area of each part is said p, now −And the area of the full leaf is 2p.Example#include using namespace std; float leafArea(float a){ return (a * a * (3.1415/2 - 1)); } int main() { float square_side = 7.0f; cout
Read MoreHow to set the date in datepicker dialog in android?
This example demonstrates about how do I set the date in datepicker dialog in Android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to res/layout/DatePickerFragment.java (Right click on the package, click new – Java Class)import android.app.DatePickerDialog; import android.app.Dialog; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import java.util.Calendar; public class DatePickerFragment extends DialogFragment { @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { ...
Read MoreWhere and how to use to static variables in android studio?
This example demonstrates about how and where do I use static variable in android studio.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; public class MainActivity extends AppCompatActivity { public static final String TAG = "I'm a Static Variable"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } ...
Read MoreHow to get the touch position on android device?
This example demonstrates about how do I get the touch position on android device.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new projectStep 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javapackage app.com.sample; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView T; EditText E1, E2; float x = 0f; float y = 0f; ...
Read MoreHow to change color of Button in Android when Clicked?
This example demonstrates about How do I change the color of Button in Android when clicked.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javaimport android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final Button button = findViewById(R.id.button); ...
Read MoreHow to detect airplane mode is on or off in Android?
This example demonstrates about How to detect airplane mode is on or off in AndroidStep 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. Step 3 − Add the following code to src/MainActivity.javapackage app.com.sample; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.os.Bundle; import android.provider.Settings; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView ...
Read MoreHTML DOM Location search Property
The Location search property returns/sets a string corresponding to the query parameters for a URL.SyntaxFollowing is the syntax −Returning value of the search propertylocation.searchValue of the protocol property setlocation.search = searchStringExampleLet us see an example for Location search property − Live Demo Location protocol form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { border-radius: 10px; } Location-protocol Current URL: ...
Read MoreArea of a circle inscribed in a rectangle which is inscribed in a semicircle?
Let us consider one semicircle is given. Its radius is R. One rectangle of length l and breadth b is inscribed in that semi-circle. Now one circle with radius r is inscribed in the rectangle. We have to find the area of the inner circle.As we know biggest rectangle that can be inscribed within the semi-circle has length l and breadth b, then the equation of l and b will be like following −Now, the biggest circle that can be inscribed within the rectangle has radius r is like below −Example#include #include using namespace std; float innerCircleArea(float R){ ...
Read MoreArc length from given Angle?
Here we will see how to get the arc length from the given angle. One circle is given. The radius of the circle is given. Our task is to get the arc length using the radius and the angle. The angle is in degree.Here r and x is given. We have to find the value of L. The formula is like below −𝐿 = 2𝜋𝑟 ∗ (𝑥/360)Example#include using namespace std; float getArcLength(float r, float x){ return (2 * 3.1415f * r) * (x / 360.0f); } int main() { float rad = 12.0f; float angle = 45.0f; cout
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