# Data Structures & Algorithms - Environment Setup

## Online Editor & Compiler

We have setup an online environment for you to compile and run your data Structure and Algorithms programs in four different programming languages: C, C++, Java, Python.

#include <stdio.h>
int main(){
int LA[3] = {}, i;
for(i = 0; i < 3; i++) {
LA[i] = i + 2;
printf("LA[%d] = %d \n", i, LA[i]);
}
return 0;
}

#include <iostream>
using namespace std;
int main(){
int LA[3] = {}, i;
cout << "Array:" << endl;
for(i = 0; i < 5; i++) {
LA[i] = i + 2;
cout << "LA[" << i <<"] = " << LA[i] << endl;
}
return 0;
}

public class ArrayDemo {
public static void main(String []args) {
int LA[] = new int[3];
System.out.println("Array:");
for(int i = 0; i < 3; i++) {
LA[i] = i+3;
System.out.println("LA[" + i + "] = " + LA[i]);
}
}
}

LA = [0, 0, 0]
x = 0
print("Array: ")
for x in range(len(LA)):
LA[x] = x+1;
print("LA", [x], " = " , LA[x])


## Local Environment Setup

If you are still willing to set up your own environment for C programming language, you need the following two tools available on your computer, (a) Text Editor and (b) The C Compiler.

### Text Editor

This will be used to type your program. Examples of few editors include Windows Notepad, OS Edit command, Brief, Epsilon, EMACS, and vim or vi.

The name and the version of the text editor can vary on different operating systems. For example, Notepad will be used on Windows, and vim or vi can be used on Windows as well as Linux or UNIX.

The files you create with your editor are called source files and contain program source code. The source files for C programs are typically named with the extension ".c".

Before starting your programming, make sure you have one text editor in place and you have enough experience to write a computer program, save it in a file, compile it, and finally execute it.

### The C Compiler

The source code written in the source file is the human readable source for your program. It needs to be "compiled", to turn into machine language so that your CPU can actually execute the program as per the given instructions.

This C programming language compiler will be used to compile your source code into a final executable program. We assume you have the basic knowledge about a programming language compiler.

Most frequently used and free available compiler is GNU C/C++ compiler. Otherwise, you can have compilers either from HP or Solaris if you have respective Operating Systems (OS).

The following section guides you on how to install GNU C/C++ compiler on various OS. We are mentioning C/C++ together because GNU GCC compiler works for both C and C++ programming languages.

## Installation on UNIX/Linux

If you are using Linux or UNIX, then check whether GCC is installed on your system by entering the following command from the command line −

\$ gcc -v


If you have GNU compiler installed on your machine, then it should print a message such as the following −

Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix = /usr .......
gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)


If GCC is not installed, then you will have to install it yourself using the detailed instructions available at https://gcc.gnu.org/install/

This tutorial has been written based on Linux and all the given examples have been compiled on Cent OS flavor of Linux system.

## Installation on Mac OS

If you use Mac OS X, the easiest way to obtain GCC is to download the Xcode development environment from Apple's website and follow the simple installation instructions. Once you have Xcode setup, you will be able to use GNU compiler for C/C++.

Xcode is currently available at developer.apple.com/technologies/tools/