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並前往http://play.integer32.com/?code=extern%20crate%20rand%3B%0Aextern%20crate%20num_bigint%20as%20bigint%3B%0A%0A%23%5Bcfg(feature%20%3D%20%22rand%22)%5D%0Afn%20main()%20%7B%0Ause%20bigint%3A%3A%7BToBigInt%2C%20RandBigInt%7D%3B%0A%0Alet%20mut%20rng%20%3D%20rand%3A%3Athread_rng()%3B%0Alet%20a%20%3D%20rng.gen_bigint(1000)%3B%0A%0Alet%20low%20%3D%20-10000.to_bigint().unwrap()%3B%0Alet%20high%20%3D%2010000.to_bigint().unwrap()%3B%0Alet%20b%20%3D%20rng.gen_bigint_range(%26low%2C%20%26high)%3B%0A%0A%2F%2F%20Probably%20an%20even%20larger%20number.%0Aprintln!(%22%7B%7D%22%2C%20a%20*%20b)%3B%0A%7D%0A%0A%23%5Bcfg(not(feature%20%3D%20%22rand%22))%5D%0Afn%20main()%20%7B%0A%7D%0A

Rust Playground

extern crate num_bigint as bigint;. #[cfg(feature = "rand")]. fn main() {. use bigint::{ToBigInt, RandBigInt};. let mut rng = rand::thread_rng();.

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