82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
//
|
|
// Created by light on 19-12-25.
|
|
//
|
|
|
|
#include <chrono>
|
|
|
|
#include <complex>
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <thread>
|
|
#include <bitset>
|
|
|
|
using namespace std::literals::chrono_literals;
|
|
using namespace std::literals::string_literals;
|
|
using namespace std::literals::complex_literals;
|
|
|
|
|
|
struct length {
|
|
double value;
|
|
enum unit {
|
|
metre,
|
|
kilometre,
|
|
millimetre,
|
|
centimetre,
|
|
inch,
|
|
foot,
|
|
yard,
|
|
mile,
|
|
};
|
|
static constexpr double factors[] =
|
|
{1.0, 1000.0, 1e-3,
|
|
1e-2, 0.0254, 0.3048,
|
|
0.9144, 1609.344};
|
|
|
|
explicit length(double v,
|
|
unit u = metre) {
|
|
value = v * factors[u];
|
|
}
|
|
|
|
|
|
};
|
|
|
|
length operator+(length lhs,
|
|
length rhs) {
|
|
return length(lhs.value +
|
|
rhs.value);
|
|
}
|
|
|
|
length operator "" _m(long double v) { return length(v, length::metre); }
|
|
|
|
length operator "" _cm(long double v) { return length(v, length::centimetre); }
|
|
|
|
// 可能有其他运算符
|
|
int main() {
|
|
|
|
std::cout << "i * i = " << 1i * 1i << std::endl;
|
|
std::cout << "Waiting for 500ms" << std::endl;
|
|
std::this_thread::sleep_for(500ms);
|
|
std::cout << "Hello world"s.substr(0, 5) << std::endl;
|
|
|
|
length l1 = length(1.0, length::metre);
|
|
length l2 = length(1.0, length::centimetre);
|
|
std::cout << l2.value << std::endl;
|
|
std::cout << (l1 + l2).value << std::endl;
|
|
|
|
// 1.0_m + 10.0_cm
|
|
std::cout << (1.0_m + 1.0_cm).value << std::endl;
|
|
|
|
// 二进制字面量
|
|
unsigned mask = 0b1101;
|
|
// 以十进制打印
|
|
std::cout << mask << std::endl;
|
|
|
|
// 打印二进制字面量
|
|
std::cout << std::bitset<4>(mask) << std::endl;
|
|
|
|
// 数字分隔符
|
|
unsigned mk = 0b111'000'000;
|
|
double pi = 3.141'5926;
|
|
return 0;
|
|
}
|