📅  最后修改于: 2022-03-11 14:55:40.050000             🧑  作者: Mango
let x = 42; // 42 is '2A' in hex
assert_eq!(format!("{:X}", x), "2A");
assert_eq!(format!("{:#X}", x), "0x2A");
assert_eq!(format!("{:X}", -16), "FFFFFFF0");