Converting a hexadecimal string to a decimal integer

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In most cases, you want to parse more than one hex byte at once. In those cases, use the hex crate.

parse this into an integer

You want to use from_str_radix. It’s implemented on the integer types.

use std::i64;

fn main() {
    let z = i64::from_str_radix("1f", 16);
    println!("{:?}", z);
}

If your strings actually have the 0x prefix, then you will need to skip over them. The best way to do that is via trim_start_matches or strip_prefix:

use std::i64;

fn main() {
    let raw = "0x1f";
    let without_prefix = raw.trim_start_matches("0x");
    let z = i64::from_str_radix(without_prefix, 16);
    println!("{:?}", z);
}

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