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Fix Standard I/O notes

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Marcello 2021-10-09 13:14:19 +02:00
parent 37f8668439
commit c7e366dfee
1 changed files with 8 additions and 7 deletions
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Rust/Rust.md
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@ -29,7 +29,7 @@ The purpose of the `Result` types is to encode error-handling information.
Rust has a number of types named `Result` in its standard library: a generic `Result` as well as specific versions for submodules. Rust has a number of types named `Result` in its standard library: a generic `Result` as well as specific versions for submodules.
### Screen Output ### Standard Output
```rs ```rs
// macro (funcs have no "!") // macro (funcs have no "!")
@ -43,18 +43,19 @@ println!("{:b}", 0b11011); // print as bits
print!(); print!();
``` ```
### User Input ### Standard Input
```rs ```rs
use io; use io;
let mut string = String::new(); // create empty string var let mut buffer = String::new();
let mut var: i32 = io:stdin().readline().trim().parse().expect("input must be a number");
io::stdin() // read line from stdin io::stdin() // read line from stdin
.readline(&mut string) // put in into a var (since var i mutable it has to be specified with &mut) .readline(&mut buffer) // put in into the string variable
.expect("Error Message"); // in case of errors return an error message (io::Result) -- NEEDED .expect("Error Message"); // in case of errors return an error message
let var: i32 = buffer.trim().parse() // returns a Result enum
let var = buffer.trim().parse::<i32>() // returns a Result enum
``` ```
The `::` syntax in the `::new` line indicates that `new` is an **associated function** of the `String` type. The `::` syntax in the `::new` line indicates that `new` is an **associated function** of the `String` type.