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  1. Hello world program. A Hello world program is usually a program made by computer programmers that are new to a programming languages, or to test if the compiler for this language is working correctly. It will simply put the text Hello, World! on the screen. [1]

  2. A teenager, or teen, is someone who is 13 to 19 years old. They can also be called "adolescents". The laws on what teenagers may do vary between countries. The term “teenager” became widely used for people who are old enough to have their own money to spend, but are not yet adults (legally, not biologically [1] [2] ), after the scientist ...