Rust Practice-Rust Data Type 1

IC爬虫

Rust Practice-Rust Data Type 1 [Copy link]

<div class='showpostmsg'>### 2.3 Data Types * Built-in support for binary (0b), octal (0o), and hexadecimal (0x) numeric literals; * Types that take up more bits can represent more numbers, at the cost of storing more extra zeros for smaller numbers; * Different data types cannot be compared. If different types need to be compared, you can use `as` to convert one operand to the same type as the other operand, for example: if a < (b as i32); * It is safe to convert a smaller type to a larger type. This operation is called type promotion; * Sometimes the `as` keyword is a bit too restrictive. If you want to have full control over the type conversion process, you can use the `try_into()` method to convert the type. To use this method, use `use std::convert::TryInto;` to import the current scope before the program. This statement unlocks the variable's `try_into()` method; * The expression in the `assert!` macro that does not evaluate to true will cause the program to crash; * ::EPSILON>); ``` * NAN values will contaminate other values. Most operations involving NAN will return NAN. A NAN value is not equal to another NAN value. * If a NAN value is likely to be generated during an operation, preventive programming is required. Use is_nan() and is_finite() to detect the result and expose the problem early.</div><script> var loginstr = '<div class="locked">To view all the contents of the post, please <a href="/bbs/member.php?mod=logging&action=login" style="color:#e60000" class="loginf">log in</a> or <a href="/bbs/member.php?mod=register_eeworld.php&action=wechat" style="color:#e60000" target="_blank">register</a></div>'; if(parseInt(discuz_uid)==0){ } </script><script type="text/javascript">(function(d,c){var a=d.createElement("script"),m=d.getElementsByTagName("script")[0],eewurl="//counter.eeworld.com.cn/pv/count/";a.src=eewurl+c;m.parentNode.insertBefore(a,m)})(document,523)</script>

hellokitty_bean

Hmm, very detailed reading notes! Thumbs up!

However, float comparisons in other languages are the same, so this one seems to have no difference.

hellokitty_bean

Just learned mut

Unused variables should be preceded by an underscore

Variable shadowing

Deconstruction is a bit complicated and requires careful practice