Why are many of the names in the examples foo or bar?

Why are many of the names in the examples foo or bar?
What is the meaning of these two words?

Reply content:

Why are many of the names in the examples foo or bar?
What is the meaning of these two words?

These two words really have an RfC as authoritative explanation: RfC 3092:etymology of "Foo"

"FOOBAR" from the World War II swearing fubar (Fucked up Beyond all Repair, a mess) homophonic.

The computer science community then takes the word apart, expressing the variable name as a label, without actual meaning, and the conventional Foo and bar represent the first and second labels.

(Hint: There is a dark pit in this answer)

See Wikipedia Https://zh.wikipedia.org/wiki/Foobar
For more details, refer to this Http://stackoverflow.com/questions/4868904/what-is-the-origin-of-foo-and-bar

This was learned with a bad boy.

The English word foo, different dictionaries to its interpretation is far from, one said from China "Fu" the pronunciation of the word, but also explained as a weapon in World War Ii. But if we put a lot of explanations in the field of programming, the Foobar is the most pertinent explanation I think. Foobar again for Foo-bar, where bar is beyond all recognition abbreviation, popular point is not recognized, a mess of meaning.

