roboter Y. wrote in post #1056317:
> i want a ruby program, is have 2 Arguments(a,b) ,which output the Prime
> zahlen between a and b. hier is my program. but it's wrong. i don't know
> where is the problem. can anyone help me?

Replace

>             f =!f

with

f = false

> p "the prime between #{a} and #{b} is #{sushu}."

Also, the last line doesn't do anything meaningful, because you do not
return the prime numbers, you print them.

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