Struct ParseIntError 

pub struct ParseIntError { /* private fields */ }

An error which can be returned when parsing an integer.

For example, this error is returned by the from_str_radix() functions on the primitive integer types (such as [i8::from_str_radix]) and is used as the error type in their FromStr implementations.

Potential causes

Among other causes, ParseIntError can be thrown because of leading or trailing whitespace in the string e.g., when it is obtained from the standard input. Using the [str::trim()] method ensures that no whitespace remains before parsing.

Example

if let Err(e) = i32::from_str_radix("a12", 10) {
    println!("Failed conversion to i32: {e}");
}