The issue with the second option is that, if we return a String and then want to do something else with the answer (possibly a further calculation from one of the other modules within the crate), we will need some method of converting the string (after checking it doesn't contain the error code) back to an f32 to pass into the second function.
- Preface
- Introducing and Installing Rust
- Variables
- Variable mutability
- Summary
- Input and Output
- Conditions, Recursion, and Loops
- Remember, Remember
- Creating Your Own Rust Applications
- Matching and Structures
- The Rust Application Lifetime
- Introducing Generics, Impl, and Traits
- Creating Your Own Crate
- Concurrency in Rust
- Now It's Your Turn!
- The Standard Library
- Chapter format
- What is the standard library?
- The standard modules
- std::Any
- std::ascii
- std::borrow
- std::boxed
- std::cell
- std::char
- std::clone
- std::cmp
- std::collections
- std::convert
- std::default
- std:env
- std:error
- std::f32
- std::f64
- std:ffi
- std::fmt
- std::fs
- std::hash
- std::i8
- std::i16
- std::i32
- std::i64
- std::io
- std::isize
- std::iter
- std::marker
- std::mem
- std:net
- std::num
- std::os
- std::panic
- std::path
- std::process
- std::ptr
- std::slice
- std::str
- std::string
- std::sync
- std::thread
- std::time
- std::u8
- std::u16
- std::u32
- std::u64
- std::usize
- std::vec
- Summary
- Foreign Function Interfaces
- Introducing our simple library
- The three-step program
- Summary
The String option
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