27accef223
Review URL: https://codereview.appspot.com/5576043 git-svn-id: http://skia.googlecode.com/svn/trunk@3087 2bbb7eff-a529-9590-31e7-b0007b416f81
22 lines
477 B
C++
22 lines
477 B
C++
#include "QuadraticUtilities.h"
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int quadraticRoots(double A, double B, double C, double t[2]) {
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B *= 2;
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double square = B * B - 4 * A * C;
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if (square < 0) {
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return 0;
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}
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double squareRt = sqrt(square);
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double Q = (B + (B < 0 ? -squareRt : squareRt)) / -2;
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int foundRoots = 0;
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if ((Q <= A) ^ (Q < 0)) {
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t[foundRoots++] = Q / A;
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}
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if ((C <= Q) ^ (C < 0)) {
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t[foundRoots++] = C / Q;
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}
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return foundRoots;
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}
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