34 lines
979 B
D
34 lines
979 B
D
double kelvinToCelsius(in double k) pure nothrow @safe {
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return k - 273.15;
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}
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double kelvinToFahrenheit(in double k) pure nothrow @safe {
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return k * 1.8 - 459.67;
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}
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double kelvinToRankine(in double k) pure nothrow @safe {
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return k * 1.8;
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}
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unittest {
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import std.math: approxEqual;
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assert(approxEqual(kelvinToCelsius(21.0), -252.15));
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assert(approxEqual(kelvinToFahrenheit(21.0), -421.87));
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assert(approxEqual(kelvinToRankine(21.0), 37.8));
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}
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void main(string[] args) {
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import std.stdio, std.conv, std.string;
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if (args.length == 2 && isNumeric(args[1])) {
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immutable kelvin = to!double(args[1]);
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if (kelvin >= 0) {
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writefln("K %2.2f", kelvin);
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writefln("C %2.2f", kelvinToCelsius(kelvin));
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writefln("F %2.2f", kelvinToFahrenheit(kelvin));
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writefln("R %2.2f", kelvinToRankine(kelvin));
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} else
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writefln("%2.2f K is below absolute zero", kelvin);
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}
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}
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