X
formatting.
The UpperHex
trait should format its output as a number in hexadecimal, with A
through F
in upper case.
For primitive signed integers (i8
to i128
, and isize
),
negative values are formatted as the two’s complement representation.
The alternate flag, #
, adds a 0x
in front of the output.
For more information on formatters, see the module-level documentation.
Basic usage with i32
:
let x = 42;
assert_eq!(format!("{:X}", x), "2A");
assert_eq!(format!("{:#X}", x), "0x2A");
assert_eq!(format!("{:X}", -16), "FFFFFFF0");Run
Implementing UpperHex
on a type:
use std::fmt;
struct Length(i32);
impl fmt::UpperHex for Length {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let val = self.0;
write!(f, "{:X}", val)
}
}
let l = Length(9);
println!("l as hex is: {:X}", l);Run
Formats the value using the given formatter.
impl UpperHex for i8 | [src] |
impl UpperHex for i16 | [src] |
impl UpperHex for i32 | [src] |
impl UpperHex for i64 | [src] |
impl UpperHex for i128 | [src] |
impl UpperHex for isize | [src] |
impl UpperHex for u8 | [src] |
impl UpperHex for u16 | [src] |
impl UpperHex for u32 | [src] |
impl UpperHex for u64 | [src] |
impl UpperHex for u128 | [src] |
impl UpperHex for usize | [src] |