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< ol class = "chapter" > < li class = "chapter-item expanded affix " > < a href = "../../about.html" > Rusty Book< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Awesome< / li > < li class = "spacer" > < / li > < li class = "chapter-item expanded " > < a href = "../../daily-dev.html" > 日常开发常用库< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../superstar.html" > Rust 明星项目< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../empowering-js.html" > 使用 Rust 增强 JS< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../games.html" > Rust开发的游戏< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../gamedev.html" > 游戏引擎< / a > < / li > < li class = "chapter-item expanded affix " > < li class = "part-title" > Awesome + Cookbook< / li > < li class = "spacer" > < / li > < li class = "chapter-item expanded " > < a href = "../../algos/awesome.html" > 实用算法< / a > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../algos/randomness.html" > 生成随机值< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../algos/sorting.html" > Vec 排序< / a > < / li > < li class = "chapter-item expanded " > < div > 压缩算法< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item " > < a href = "../../algos/compression/tar.html" > 使用.tar包< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < div > 密码学< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item " > < a href = "../../algos/cryptography/hashing.html" > 哈希< / a > < / li > < li class = "chapter-item " > < a href = "../../algos/cryptography/encryption.html" > 加密< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < div > 数学计算< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item " > < a href = "../../algos/math/linear-algebra.html" > 线性代数< / a > < / li > < li class = "chapter-item " > < a href = "../../algos/math/trigonometry.html" > 三角函数< / a > < / li > < li class = "chapter-item " > < a href = "../../algos/math/complex.html" > 复数< / a > < / li > < li class = "chapter-item " > < a href = "../../algos/math/statistics.html" > 统计学< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../algos/math/misc.html" class = "active" > 杂项< / a > < / li > < / ol > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../../datastructures/awesome.html" > 数据结构< / a > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../datastructures/bitfield.html" > 位字段< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../../cmd/awesome.html" > 命令行< / a > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../cmd/parsing.html" > 参数解析< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../cmd/ansi.html" > 终端输出格式化< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < a href = "../../os/awesome.html" > 操作系统< / a > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../os/processor.html" > 处理器< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../os/command.html" > 调用系统命令< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < div > 并发< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../cocurrency/threads.html" > 线程< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../cocurrency/parallel.html" > 使用rayon并行处理数据< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < div > 数据库< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../database/sqlite.html" > SQLite< / a > < / li > < li class = "chapter-item expanded " > < a href = "../../database/postgres.html" > Postgres< / a > < / li > < / ol > < / li > < li class = "chapter-item expanded " > < div > 日期和时间< / div > < a class = "toggle" > < div > ❱< / div > < / a > < / li > < li > < ol class = "section" > < li class = "chapter-item expanded " > < a href = "../../datetime/duration.html" > 时间计算和转换< / a > < / li > < li class = "
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< main >
< h1 id = "杂项" > < a class = "header" href = "#杂项" > 杂项< / a > < / h1 >
< h3 id = "大整数-big-int" > < a class = "header" href = "#大整数-big-int" > 大整数 Big int< / a > < / h3 >
< p > 使用 < a href = "https://docs.rs/num/0.2.0/num/struct.BigInt.html" > BitInt< / a > 可以对超过 128bit 的整数进行计算。< / p >
< pre > < pre class = "playground" > < code class = "language-rust editable edition2021" > use num::bigint::{BigInt, ToBigInt};
fn factorial(x: i32) -> BigInt {
if let Some(mut factorial) = 1.to_bigint() {
for i in 1..=x {
factorial = factorial * i;
}
factorial
}
else {
panic!(" Failed to calculate factorial!" );
}
}
fn main() {
println!(" {}! equals {}" , 100, factorial(100));
}
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