OrangePi Zero3: Ubuntu Focal System

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Chapt 3. Instructions for use of Debian/Ubuntu Server and Xfce desktop system

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Chapter 3 contents

3.33.3. Ubuntu Focal System

1) Ubuntu Focal has a gcc compilation tool chain installed by default, which can directly compile C language programs in the Linux system of the development board

a. The version of a.gcc is as follows


orangepi@orangepi:~$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

b. Write the hello_world.c program in C language


orangepi@orangepi:~$ vim hello_world.c
#include 
int main(void)
{
printf("Hello World!\n");
return 0;
}

c. Then compile and run hello_world.c

orangepi@orangepi:~$ gcc -o hello_world hello_world.c
orangepi@orangepi:~$ ./hello_world
Hello World!

2) Ubuntu Focal has Python3 installed by default

a. The specific version of Python3 is as follows

orangepi@orangepi:~$ python3
Python 3.8.10 (default, Nov 14 2022, 12:59:47)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
Use the Ctrl+D shortcut to exit python's interactive mode.

b. Write the hello_world.py program in Python language

orangepi@orangepi:~$ vim hello_world.py
print('Hello World!')

c. The result of running hello_world.py is as follows

orangepi@orangepi:~$ python3 hello_world.py
Hello World!

3) Ubuntu Focal does not install Java compilation tools and operating environment by default

a. You can use the following command to install openjdk- 17

orangepi@orangepi:~$ sudo apt install -y openjdk-17-jdk

b. After installation, you can check the version of Java

orangepi@orangepi:~$ java --version
openjdk 17.0.2 2022-01- 18
OpenJDK Runtime Environment (build 17.0.2+8-Ubuntu- 120.04
OpenJDK 64-Bit Server VM (build 17.0.2+8-Ubuntu- 120.04, mixed mode, sharing)

c. Write the Java version of hello_world.java

orangepi@orangepi:~$ vim hello_world.java
public class hello_world
{
public static void main(String[] args)
{
System.out.println("Hello World!");
}
}
d. Then compile and run hello_world.java
orangepi@orangepi:~$ javac hello_world.java
orangepi@orangepi:~$ java hello_world
Hello World!

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