DEV Community: Jeevan Chandra Joshi

C++ Productivity Hacks

Jeevan Chandra Joshi — Sat, 12 Jun 2021 12:20:23 +0000

1. Master Header File

#include <bits/stdc++.h>

2. Faster I/O Operations

ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

3. Macros for Debugging

#define deb(x) cout << #x << " : " << x << "\n"

4. Number of Digits

int number = 12345;
int digits = floor(log10(number) + 1); // 5

5. Swap Two Numbers

int a = 10;
int b = 20;
swap(a, b); // 20 10

6. Number of Set Bits

int n = 15;
int setBit = __builtin_popcount(n); // 4

7. Auto Keyword

vector<int> v{1, 2, 3, 4, 5};
for (auto x : v)
  cout << x << " "; // 1 2 3 4 5

8. Inbuilt GCD Function

int x = 12;
int y = 16;
int gcd = __gcd(x, y); // 4

9. Lambda Function

auto add = [](int x, int y) {
  return x + y;
};
int sum = add(10, 20); // 30

10. Accumulate Function

int sum = 10;
int arr[] = {20, 30, 40};
sum = accumulate(arr, arr + 3, sum); // 100

Tip: Use "\n" instead of endl;

My Hacktoberfest Story

Jeevan Chandra Joshi — Sat, 31 Oct 2020 02:33:39 +0000

Introduction 🚀

Hey, there! 👋🏻
I am Jeevan Joshi

Currently I am pursuing Master of Computer Applications from G B Pant University.
I am a Chess Player, Campus Ambassador & Competitive Programmer and now I am also a Open Source contributor.

Background 🚀

I am an enthusiastic Programmer and actively involved in Competitive Programming.

I started my Open Source journey from Hacktoberfest 2020.

Progress 🚀

My current progress in Hacktoberfest is that my 4 pull request has been accepted for Hacktoberfest 2020.

Contributions 🚀

In this Hacktoberfest I contributed in two roles

As a participant, I make more than 4 quality pull requests and all of them are accepted for Hacktoberfest 2020.

And as a maintainer, I reviewed more than 1000 pull requests.

Reflections 🚀

Overall, it was a very amazing experience for Hacktoberfest 2020.
This is my first Hacktoberfest and I learn a lot of new things and also make some new connections.
Looking for more such events.
For now my next step in Open Source is Google Summer of Code.

"Hello, World!" in 10 different Programming Languages.

Jeevan Chandra Joshi — Mon, 31 Aug 2020 11:09:11 +0000

“Hello, World!” is a very first program from which every programmer begins their programming journey.

Now, We also start our journey by writing “Hello World” in 10 different programming languages.

1. C Programming Language

C is a general-purpose, procedural programming language developed at AT&T bell labs by Dennis Ritchie in 1972.

#include <stdio.h>
int main()
{
    printf("Hello, World!");
    return 0;
}

2. C++ Programming Language

C++ is a powerful general-purpose programming language developed by Bjarne Stroustrup in1979.

#include <iostream>
using namespace std;
int main()
{
    cout<<"Hello, World!";
    return 0;
}

3. Java Programming Language

Java is a high-level, modern, object-oriented programming language developed by James Goslin in 1995.

public class Program
{
    public static void main(String[] args)
    {
        System.out.print("Hello, World!");
    }
}

4. Python Programming Language

Python is a high-level interpreted programming language developed by Guido Van Rossum in 1991.

print("Hello, World!")

5. C# Programming Language

C# is an elegant object-oriented programming language developed by Microsoft in 2000.

using System;
namespace Hello
{
    class World
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
        }
    }
}

6. JavaScript Programming Language

JavaScript is one of the most popular programming languages developed by Brendan Eich in 1995.

console.log("Hello, World!");

7. PHP Programming Language

Hypertext Preprocessor (PHP) is a free, highly popular, open source scripting language developed by Rasmus Lerdorf in 1995.

<?php
    echo "Hello, World!";
?>

8. Swift Programming Language

Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple in 2014.

print("Hello, world!")

9. Ruby Programming Language

Ruby is a dynamic, object-oriented, general-purpose programming language developed by Yukihiro Matsumoto in 1995.

puts "Hello, World!"

10. Kotlin Programming Language

Kotlin is a statically-typed programming language that runs on the Java virtual machine developed by JetBrains in 2011.

fun main(args: Array<String>)
{
    print("Hello, World!");
}