Tutorial by Examples: b

Using the dynamic variable %Random%, we can get a random integer from 0 to 32767. For example: echo %random% This obviously, returns an integer from 0 to 32767. But sometimes we want it to be in a specific range, say from 1 to 100. Generating Random Numbers Within Specific Range The basic me...

Unfortunately, batch does not have a built-in method to generate alphabets, but using %random% and for loop, we can 'generate' alphabets. This is a simple idea of how this works. set /a result=(%random%*26/32768)+1 for /f "tokens=%result%" %%I in ("A B C D E F G H I J K L M N O P...

The MyFrame class the extends JFrame and also contains the main method import javax.swing.JFrame; public class MyFrame extends JFrame{ //main method called on startup public static void main(String[] args) throws InterruptedException { //creates a frame window ...

The below example uses Android.Runtime.InputStreamInvoker and Android.Runtime.OutputStreamInvoker types obtain Java.IO.InputStream and Java.IO.OutputStream. Once we have a Java.IO.InputStream instance, we can use its .Available() method to get the number of available response bytes which we can use...

Grouping with the data.table package is done using the syntax dt[i, j, by] Which can be read out loud as: "Take dt, subset rows using i, then calculate j, grouped by by." Within the dt statement, multiple calculations or groups should be put in a list. Since an alias for list() is .(), bo...

To send a file and form data in single request, content should have multipart/form-data type. using System; using System.Collections.Generic; using System.IO; using System.Net; using System.Threading.Tasks; public async Task<string> UploadFile(string url, string filename, Diction...

basename(): Given a string containing the path to a file or directory, this function will return the trailing name component. This function will return only the last part of an URL $url = "http://example.com/project/controller/action/param1/param2"; $parts = basename($url); // Out...

Static members have class scope as opposed to object scope C++ Example // define in header class Singleton { public: static Singleton *getInstance(); private: Singleton() {} static Singleton *instance; }; // initialize in .cpp Singleton* Singleton::instance = 0...

Many argue that Java is ONLY pass-by-value, but it's more nuanced than that. Compare the following C++ and Java examples to see the many flavors of pass-by-value (aka copy) and pass-by-reference (aka alias). C++ Example (complete code) // passes a COPY of the object static void passByCopy(Pa...

Abstract Method declared without an implementation C++ pure virtual method virtual void eat(void) = 0; Java abstract method abstract void draw(); Abstract Class cannot be instantiated C++ cannot be instantiated; has at least 1 pure virtual method class AB {public: virtual void f() = ...

data.service.ts: import { Injectable } from '@angular/core'; import { Http } from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class DataService { constructor(private http: Http) { } fetchData(){ return this.http.get('https://dinstruct-d4b62.firebaseio....

Add a new file to Xcode (File > New > File), then select “Source” and click “Header File“. Name your file “YourProjectName-Bridging-Header.h”. Example: In my app Station, the file is named “Station-Bridging-Header”. Create the file. Navigate to your project build settings ...

// array var arr = [ 'one', 'two', 'three', 'four' ]; $.each(arr, function (index, value) { console.log(value); // Will stop running after "three" return (value !== 'three'); }); // Outputs: one two three

In iTunes Connect, click iTunes Connect in the top left corner of the window to get back to the main menu. Select Users and Roles, then click the Sandbox Testers tab. Click + next to the “Tester” title. Fill out the information and click Save when you’re done. You can make up a first and last nam...

For an executable file or command exec, running this will list all system calls: $ ptrace exec To display specific system calls use -e option: $ strace -e open exec To save the output to a file use the -o option: $ strace -o output exec To find the system calls an active program uses, us...

This is continuation of previous example. Cascading DropDown for country's city name. This method will be called by Jquery when user is done with country selection in parent dropdown. I have followed MVC concept and provided the basic approach for cascading dropdown. Ajax will call GetCityName met...

import csv #------ We will write to CSV in this function ------------ def csv_writer(data, path): #Open CSV file whose path we passed. with open(path, "wb") as csv_file: writer = csv.writer(csv_file, delimiter=',') for line in data: ...

Pseudorandom Distribution Accorinding to this Stack Overflow answer, user CherryDT pointed out this code: set /a num=%random% %% 100 does not give a uniform distribution. The internal dynamic variable %random% does gives a uniform distribution, but the above code will not be a uniformed random...

Step 1: Make a design of GridView for displaying your data (HTML Code): <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false"> <Columns> <asp:TemplateField HeaderText="ID"> <ItemTemplate> ...

Design of Nested-GridView (HTML Code): <asp:GridView ID="gvParent" runat="server" AutoGenerateColumns="false" OnRowDataBound="gvParent_RowDataBound"> <Columns> <asp:TemplateField HeaderText="Parent Column"> ...