rust convertinging string to int
To convert a string to an integer in Rust, you can use the parse
method provided by the FromStr
trait. Here's an example:
let number: i32 = "42".parse().unwrap();
In this example, the parse
method is called on the string "42"
. The parse
method attempts to parse the string as an integer and returns a Result
type. To extract the integer value, we can use the unwrap
method, which returns the value if it is Ok
, or panics if it is Err
.
If you're not sure whether the string can be successfully parsed as an integer, you can handle the Result
type explicitly. Here's an example:
let number = match "42".parse::<i32>() {
Ok(n) => n,
Err(_) => {
// Handle the error case here
panic!("Failed to parse the string as an integer");
}
};
In this example, the parse
method is called with the type annotation ::<i32>()
to indicate that we want to parse the string as an i32
. The match
statement is used to handle the Result
type, with the Ok
branch returning the parsed integer and the Err
branch handling the error case.
Remember to replace "42"
with the actual string you want to convert to an integer.