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