C++ Getting Started
Prateek Narang
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.
[Topics 02] C++ Getting Started
By Prateek Narang
