• To get started with Raspberry Pi, we have to store required OS on SD card.
• Now to store OS on SD card we need to install OS on SD card. If you want to know how to install/store OS on SD card you can refer Installing Operating System Image on SD card.
• Here, we installed the Raspbian OS on SD card.
• Now, we have an SD card with installed OS and Raspberry Pi Board.
• Initially to use raspberry Pi we need computer monitor or Digital Display.
• We can directly connect Raspberry Pi to the Digital Display using HDMI cable.

• But, if we have a computer monitor (VGA Display), then we need an HDMI to VGA converter along with a VGA cable for connecting Raspberry Pi with monitors. HDMI to VGA converter and VGA cable is shown below.

Now, connect the Raspberry Pi to the Display/monitor and Power-On Raspberry Pi. We will get a Black command window asking for Login and Password as shown below

• Then, use the following login name and password

                raspberrypi Login: pi

                Password: raspberry

• This is the default user name and password. You can change the password after the first login.

The above command window can be used to operate Raspberry Pi.

• To get GUI environment on Raspberry Pi, use below command,                              

 startx

And we will get Home Screen of Raspberry Pi as shown below:

• On display, there is a symbol of raspberry to the top-left corner of display. After clicking on it, we will get menu as shown below,

• As we can see, the Raspbian OS has installed Python 2 & 3. It also has different programming IDE like Geany, BlueJ Java IDE, etc. As raspberry pi 3 has On-chip WiFi, we can connect it to the network and will get access over Internet.
• We can also change password of “Pi” user.
• To change password, click on preferences and then select Raspberry Pi Configuration which will provide a pop-up window.

• Then, click on change password option shown below.

Now, we are quite familiar with Raspberry Pi OS.

How to write C program on Raspbian OS

• So, let’s write our First C code on Raspbian and execute it.
• First Create Empty file and label it with .c extension.
• Now write a small program to print “Hello World”

Program

#include<stdio.h>
int main(){
     printf(“Hello World”);
     return 0;
}

After writing the code, open terminal (ctrl+alt+t) to execute it. Then, type following commands for compiling and execution.