forked from mpusz/mp-units
66 lines
1.9 KiB
C++
66 lines
1.9 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 <iostream>
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#ifdef MP_UNITS_MODULES
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import mp_units;
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#else
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#include <mp-units/math.h> // IWYU pragma: keep
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#include <mp-units/ostream.h>
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#include <mp-units/systems/isq/electromagnetism.h>
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#include <mp-units/systems/si/si.h>
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#endif
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int main()
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{
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using namespace mp_units;
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using namespace mp_units::si::unit_symbols;
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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 CC = isq::capacitance(0.47 * uF);
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constexpr auto V0 = isq::voltage(5.0 * V);
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constexpr auto RR = isq::resistance(4.7 * si::kilo<si::ohm>);
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for (auto tt = 0 * ms; tt <= 50 * ms; ++tt) {
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const QuantityOf<isq::voltage> auto Vt = V0 * exp(dimensionless(-tt / (RR * CC)));
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// TODO try to make the below work instead
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// const QuantityOf<isq::voltage> auto Vt = V0 * exp(-tt / (RR * CC));
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std::cout << "at " << tt << " voltage is ";
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if (Vt >= 1 * V)
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std::cout << Vt.in(V);
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else if (Vt >= 1 * mV)
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std::cout << Vt.in(mV);
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else if (Vt >= 1 * uV)
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std::cout << Vt.in(uV);
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else if (Vt >= 1 * nV)
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std::cout << Vt.in(nV);
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else
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std::cout << Vt.in(pV);
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std::cout << "\n";
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}
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}
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