1. python:



Python is a very well known programing language because of its simplicity and also because of its easy use and easy understandings.
Python is a dynamic, interpreted (bytecode-compiled) language. There are no type declarations of variables, parameters, functions, or methods in source code. This makes the code short and flexible, and you lose the compile-time type checking of the source code.

Libraries in python

Python Libraries are a set of useful functions that eliminate the need for writing codes from scratch. There are over 137,000 python libraries present today and they play a vital role in developing machine learning, data science, data visualization, image and data manipulation applications, and more. some of them are given bellow.
..Tensor flow
..scikit-learn
..Numpy
..keras
..py-Torch , and many more.....

Uses of python in Industry

First off, what industries use Python? Because of its high level of functionality, many industries can't do without it, including: web development, data science and data analysis, machine learning, startups, and the finance industry, among others.

Python is commonly used for developing websites and software, task automation, data analysis, and data visualization. Since it's relatively easy to learn, Python has been adopted by many non-programmers such as accountants and scientists, for a variety of everyday tasks, like organizing finances.

Python programming is a skill that can be used in virtually any industry, as well as in positions far beyond just software development. From industries like finance, healthcare, and insurance, to fields like aerospace to entertainment — Python-based tech is driving innovation and new solutions

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2.C/C++



C++ was developed as an extension of C, and both languages have almost the same syntax. The main difference between C and C++ is that C++ support classes and objects, while C does not.

C++ is one of the predominant languages for the development of all kind of technical and commercial software. C++ introduces Object-Oriented Programming, not present in C. Like other things, C++ supports the four primary features of OOP: encapsulation, polymorphism, abstraction, and inheritance.

Libraries in C/C++

The ANSI C standard library consists of 24 C header files which can be included into a programmer's project with a single directive.
C++ comes with two standard libraries: the old C library (libc. lib), and the new C++ library (libcp. lib), which is logically divided into the stream library, and STL, the standard template library. Many implementations also include a pre-standard stream library for backward compatibility.
Libraries are used in C/C++ are used as a header files.
Examples are given below:
..#include<stdio.h>
..#include<string.h>

Uses of C/C++ in Industries:

C++ is a very popular language for performance-critical applications that rely on speed and efficient memory management. It's used in a wide range of industries including software and game development, VR, robotics, and scientific computing.

Advanced medical equipment makers use C++, and defense contractors use it for mission-specific software APIs. Well-known tech companies and organizations using C++ include Evernote, LinkedIn, Microsoft, Opera, NASA, and Facebook. Evernote switched from . NET to C++ for more speed and better graphics.
Fastest Language!
C++ C++ is one of the most efficient and fastest languages. It is widely used by competitive programmers for its execution speed and Standard Template Libraries(STL).
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3.JAVA


Java is a popular programming language, created in 1995. It is owned by Oracle, and more than 3 billion devices run Java. It is used for: Mobile applications (specially Android apps).
Java is a widely used object-oriented programming language and software platform that runs on billions of devices, including notebook computers, mobile devices, gaming consoles, medical devices and many others. The rules and syntax of Java are based on the C and C++ languages.

Libraries in JAVA.

A Java library is just a collection of classes that have been written by somebody else already. You download those classes and tell your computer about them, and then you can use those classes in your code.
Examples:
..Java Standard libraries
..apache Commons
..Jackson.....more

Use of Java in Industries:

The IT industry, especially in India, heavily uses Java in most of their projects. Being a Java developer, one should have the knowledge about the Java-based tools and technologies used by the most of the IT industries such as Android application development, Web Development,etc.

The companies using Java are most often found in United States and in the Computer Software industry. Java is most often used by companies with 10-50 employees and 1M-10M dollars in revenue.
 
Java is very big in Financial Services. Lots of global Investment banks like Goldman Sachs, Citigroup, Barclays, Standard Charted, and other banks use Java for writing front and back office electronic trading systems, writing settlement and confirmation systems, data processing projects, and several others.
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