Number System Conversion

Decimal to Binary

 Decimal to Octal

Decimal to Hexadecimal

Binary to Decimal

Binary Fraction to Decimal

Octal to Decimal

Octal Fraction to Decimal

Binary to Octal

Binary Fraction to Octal

Octal to Binary

Octal Fraction to Binary

Binary to Hexadecimal

Binary Fraction to Hexadecimal

Hexadecimal to Binary

How to Swap Two Arrays In C Language

 

#include<stdio.h>

void main()

{

  int a[5] = {5,6,7,8,9};

  int b[5] = {1,2,3,4,5};

  

  int i,swap;

  for(i=0;i<5;i++)

  {

    swap = a[i];

    a[i] = b[i];

    b[i] = swap;

  } 

  printf("A = ");

  for(i=0;i<5;i++)

    printf("%d ",a[i]);

  printf("\nB = ");

  for(i=0;i<5;i++)

    printf("%d ",b[i]); 

  printf("\n");

}

Largest of three numbers in C

 #include <stdio.h>

int main()

{

 int x,y,z;

 clrscr();

 printf("Enter three numbers :");

 scanf("%d,%d,%d",&x,&y,&z);

 if(x>y)

 {

   if(x>z)

     printf("Largest value : %d ",x);

   else

     printf("Largest value : %d ",z);

 }

 else

 {

   if(y>z)

     printf("Largest value : %d",y);

   else

     printf("Largest value : %d",z);

 }

 getch();

}

C language MCQ (Multiple Choise Questions)

Art of C Programming

1 . Address stored in the pointer variable is of type __________

 Character

 Array

 Integer

 Floating

 

2. "*" is called as ___________

 Address Operator

 Scope Resolution Operator

 Value at Operator

 None of these

3. Comment on the following pointer declaration?

     int *ptr, p;

 ptr is a pointer to integer, p is not.

 ptr and p, both are pointers to integer.

 ptr is pointer to integer, p may or may not be.

 ptr and p both are not pointers to integer.

4. Which of the following are correct syntaxes to send an array as a parameter to function

 func(&array);

 func(**array);

 func(*array);

 func(array[size]);

5. Which of the following is not possible in C?

 Array of function pointer

 Returning a function pointer

 Comparison of function pointer

 None of the mentioned

 

Answers

1. Integer

2.  Value at Operator

3. ptr is a pointer to integer, p is not.

4. func(&array);

5. None of the mentioned

Printing Pattern in C | Inverted Half Pyramid

 

#include<stdio.h>

void main()

{

int i,j,r=6;

clrscr();

  for(i=1;i<=r;i++)

  {

   for(j=r;j>=i;j--)

   {

     printf("*");

   }

   printf("\n");

  }

getch();

}

How to integrate vimeo videos to android app

 

Vimeo-Player Using Exoplayer   

This sample demonstrates how to use the vimeo video with exoplayer

 

 

Prerequisites

• Vimeo Developer Create app on developer account
• Vimeo Networking API Java networking library used for interacting with the Vimeo API
• ExoPlayer Create media player for Android

 

Source Code

 

activity_main.xml

 

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <com.google.android.exoplayer2.ui.PlayerView
        android:id="@+id/video_view"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Play"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"

        />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.logiclab.vimeo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.google.android.exoplayer2.MediaItem;
import com.google.android.exoplayer2.SimpleExoPlayer;
import com.google.android.exoplayer2.ui.PlayerView;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.RequestParams;
import com.loopj.android.http.TextHttpResponseHandler;
import com.vimeo.networking.Configuration;
import com.vimeo.networking.VimeoClient;


import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import cz.msebera.android.httpclient.Header;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private static final String VIMEO_ACCESS_TOKEN = "access token"; 
    private static final String VIMDEO_ID = "Your video id";

    private PlayerView playerView;
    private SimpleExoPlayer player;

    //Release references
    private boolean playWhenReady = false; //If true the player auto play the media
    private int currentWindow = 0;
    private long playbackPosition = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Reference exoplayer view
        playerView = findViewById(R.id.video_view);
        Button playBtn = findViewById(R.id.button2);

        playBtn.setOnClickListener(this);

        //Build vimeo configuration
        configVimeoClient();

    } //onCreate


    private void createMediaItem(String url) {
        MediaItem mediaItem = MediaItem.fromUri(url);
        player.setMediaItem(mediaItem);
    }


    private void initializePlayer() {

        //To play streaming media, you need an ExoPlayer object.
        //SimpleExoPlayer is a convenient, all-purpose implementation of the ExoPlayer interface.
        player = new SimpleExoPlayer.Builder(this).build();
        playerView.setPlayer(player);

        callVimeoAPIRequest();

        //Supply the state information you saved in releasePlayer to your player during initialization.
        player.setPlayWhenReady(playWhenReady);
        player.seekTo(currentWindow, playbackPosition);
        player.prepare();
    }


    private void callVimeoAPIRequest() {

        String videolink = "https://player.vimeo.com/video/" + VIMDEO_ID +"/config";

        AsyncHttpClient client = new AsyncHttpClient();
        RequestParams params = new RequestParams();
        //params.put("key", "value");
    //    params.put("more", "data");
        client.get(videolink, params, new TextHttpResponseHandler() {
                    @Override
                    public void onSuccess(int statusCode, Header[] headers, String res) {
                        // called when response HTTP status is "200 OK"
                        try {

                            JSONObject jsonObject = new JSONObject(res);
                            JSONObject req = jsonObject.getJSONObject("request");
                            JSONObject files = req.getJSONObject("files");
                            JSONArray progressive = files.getJSONArray("progressive");

                            JSONObject array1 = progressive.getJSONObject(1);
                            String v_url=array1.getString("url");

                            Log.d("URLL ",v_url);

                            createMediaItem(v_url);

                        } catch (JSONException e){
                            e.printStackTrace();
                        }
                    }

                    @Override
                    public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
                        // called when response HTTP status is "4XX" (eg. 401, 403, 404)
                    }
                }
        );
    }

    private void configVimeoClient() {
        Configuration.Builder configBuilder =
                new Configuration.Builder(MainActivity.VIMEO_ACCESS_TOKEN) //Pass app access token
                        .setCacheDirectory(this.getCacheDir());
        VimeoClient.initialize(configBuilder.build());
    }

    @Override
    public void onClick(View v) {
        player.setPlayWhenReady(true);
    }

    @Override
    public void onStart() {
        super.onStart();
            initializePlayer();
    }

}

Android Manifest.xml

set permissions

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />

build.gradle(:app)

add

compileOptions {
    sourceCompatibility 1.8
    targetCompatibility 1.8
}

 dependencies

//Vimeo Network
implementation "com.vimeo.networking:vimeo-networking:1.1.3"
//Full ExoPlayer library
implementation 'com.google.android.exoplayer:exoplayer:2.12.0'
//Android Async Http Client
implementation 'com.loopj.android:android-async-http:1.4.9' 

 

 

 

 

 

 https://guides.codepath.com/android/Using-Android-Async-Http-Client

Sending a Network Request

Now, we just create an AsyncHttpClient, and then execute a request specifying an anonymous class as a callback:

import com.loopj.android.http.*;
import cz.msebera.android.httpclient.Header;

AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
params.put("key", "value");
params.put("more", "data");
client.get("http://www.google.com", params, new TextHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, String res) {
            // called when response HTTP status is "200 OK"
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, String res, Throwable t) {
            // called when response HTTP status is "4XX" (eg. 401, 403, 404)
        }	
    }
);

This will automatically execute the request asynchronously and fire the onSuccess when the response returns a success code and onFailure if the response does not.

 

Cron jobs

 

Cron Jobs in Ubuntu

Cron is a time-based job scheduling. Cron runs in the background and tasks scheduled with cron, referred to as “cron jobs,” are executed automatically, making cron useful for automating maintenance-related tasks.

Commands

crontab -e : Edit your cron jobs.
crontab -l : List the all your cron jobs.
crontab -r : Delete the current cron jobs.

The schedule component of the syntax is broken down into 5 different fields, which are written in the following order:

Field	Allowed Values
minute	0-59
hour	0-23
Day of the month	1-31
month	1-12 or JAN-DEC
Day of the week	0-6 or SUN-SAT

Format like this

minute hour day_of_month month day_of_week command_to_run

 To define the time you can provide concrete values for

 minute (m), hour (h), day of month (dom), month (mon),

 and day of week (dow) or use '*' in these fields (for 'any').# 

 Notice that tasks will be started based on the cron's system

 daemon's notion of time and timezones.

Examples

Every minutes

* * * * * php /var/www/html/yiitest2.0.39/yii test

you can run a backup of all your user accounts at 5 a.m every week with:

0 5 * * 1 tar -zcf /var/backups/home.tgz /home/

12 * * * * - Run the command 12 minutes after every hour

0 4 * * * - Run the command every day at 4:00 AM.

*/15 * * * * - Run the command every 15 minutes

Cronjob in Yii2

Create console application

In advance template there is already a file yii. And there is no need to run it as php, it is Linux script.

Create cron service command

Create a controller in console/controllers

I have created as TestController.php

<?php

namespace console\controllers;

use yii\console\Controller;

/**
 * Test controller
 */
class TestController extends Controller {

    public function actionIndex() {
        echo "cron service runnning";
    }

    public function actionMail($to) {
        echo "Sending mail to " . $to;
    }

}

This controller should be use the console controller name space

use yii\console\Controller;

How to run it

run it as

yii test

Execute PHP Script Automatically at a Specified Time