Agenda

C++ Introduction
C++ Applications
Boilerplate
Input Output
Add numbers

C++ is a cross-platform language that can be used to create high-performance applications.
C++ was developed by Bjarne Stroustrup, in 1979 at Bell Labs as an extension to the C language.
C++ gives programmers a high level of control over system resources and memory.
The language was updated multiple times leading to versions C++11, C++14, C++17, C++ 20.

Introduction to C++

C++ Superpower 🔥

SPEED

C++ can be found in code of operating systems
Graphical User Interfaces & embedded systems
Many gaming engines are written in C++
Web-browsers like Mozilla, Chrome are written in C++
Compilers for many languages are written in C++
Banking Applications
Libraries & frameworks for Machine Learning like Tensor-flow by Google.

Where it is used?

Code - A Quick Look 👀

Boilerplate

#include <iostream>
using namespace std;

int main() {
  // Your Code goes here

  return 0;
}

Hello World!

#include <iostream>
using namespace std;

int main() {
  // Your Code goes here
  cout << "Hello World!";

  return 0;
}

How to run C++ Code? 🧐

An integrated development environment (IDE) is software for building applications that combines common developer tools into a single graphical user interface (GUI)

To run a C++ on our machine, we need
- Text Editor
- C++ Compiler
- Command Line / Terminal to invoke the compiler

IDE

ide.new

Online IDE by InterviewBit

#include <iostream>
using namespace std;

int main() {
  cout << "Hello World!";
  return 0;
}

Input - Output

Variables

To store data from user input we need to create buckets in the memory, the buckets are called Variables. Each variable is of a certain datatype.

Variables Demo

Let's take an example of Integer variables, that can hold an integer type of data.

Challenge

Take input 3 numbers and print their sum.

Summary

Header files contain some predefined code.
Every C++ program starts execution from main function.
We can write comments in the code, which are ignored by the compiler.
main() is the entry point of the program.
We use 'cin' object for Input and 'cout' for Output.
We need to create variables to store data.