rust/src/test/run-pass/exponential-notation.rs

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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![feature(macro_rules)]
use s = std::num::strconv;
use to_str = std::num::strconv::float_to_str_common;
macro_rules! t(($a:expr, $b:expr) => { { let (r, _) = $a; assert_eq!(r, $b.to_strbuf()) } })
pub fn main() {
// Basic usage
t!(to_str(1.2345678e-5, 10u, true, s::SignNeg, s::DigMax(6), s::ExpDec, false),
"1.234568e-5")
// Hexadecimal output
t!(to_str(7.281738281250e+01, 16u, true, s::SignAll, s::DigMax(6), s::ExpBin, false),
"+1.2345p+6")
t!(to_str(-1.777768135071e-02, 16u, true, s::SignAll, s::DigMax(6), s::ExpBin, false),
"-1.2345p-6")
// Some denormals
t!(to_str(4.9406564584124654e-324, 10u, true, s::SignNeg, s::DigMax(6), s::ExpBin, false),
"1p-1074")
t!(to_str(2.2250738585072009e-308, 10u, true, s::SignNeg, s::DigMax(6), s::ExpBin, false),
"1p-1022")
}