A "hello world" program is a computer program that prints out "Hello, world!" on a display device. It is used in many introductory tutorials for teaching a programming language and many students use it as their first programming experience in a language.
Wikipedia has a page that shows the hello world! program in about 200 programming languages. Here are the shortest and the longest hello world! program I found. The shortest is written in APL and the longest is written in Redcode:
Wikipedia has a page that shows the hello world! program in about 200 programming languages. Here are the shortest and the longest hello world! program I found. The shortest is written in APL and the longest is written in Redcode:

