forked from mpusz/mp-units
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*
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Copyright (c) 2003-2020 Andy Little.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see http://www.gnu.org/licenses./
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*/
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/*
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capacitor discharge curve using compile_time
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physical_quantities
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*/
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#include <units/physical/si/capacitance.h>
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#include <units/physical/si/resistance.h>
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#include <units/physical/si/time.h>
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#include <units/physical/si/voltage.h>
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#include <cmath>
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#include <iostream>
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int main()
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{
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using namespace units;
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using namespace units::si;
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std::cout << "mp-units capacitor time curve example...\n";
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std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
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std::cout.precision(3);
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constexpr auto C = 0.47q_uF;
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constexpr auto V0 = 5.0q_V;
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constexpr auto R = 4.7q_kR;
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for (auto t = 0q_ms; t <= 50q_ms; ++t) {
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const Voltage AUTO Vt = V0 * std::exp(-t / (R * C));
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std::cout << "at " << t << " voltage is ";
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if (Vt >= 1q_V)
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std::cout << Vt;
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else if (Vt >= 1q_mV)
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std::cout << quantity_cast<millivolt>(Vt);
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else if (Vt >= 1q_uV)
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std::cout << quantity_cast<microvolt>(Vt);
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else if (Vt >= 1q_nV)
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std::cout << quantity_cast<nanovolt>(Vt);
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else
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std::cout << quantity_cast<picovolt>(Vt);
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std::cout << "\n";
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}
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}
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