Nguyen Quy Anh
27 lines
896 B
C++
27 lines
896 B
C++
#pragma once
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#include <math.h>
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struct Vector2d {
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double x, y;
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Vector2d(double a, double b) : x(a), y(b) {}
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Vector2d() : x(.0), y(.0) {}
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Vector2d operator+(Vector2d v) const { return Vector2d(v.x + x, v.y + y); }
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Vector2d operator-(Vector2d v) const { return Vector2d(x - v.x, y - v.y); }
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Vector2d operator-(double a) const { return Vector2d(x - a, y - a); }
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Vector2d operator+(double a) const { return Vector2d(x + a, y + a); }
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Vector2d operator/(double a) const { return Vector2d(x / a, y / a); }
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Vector2d operator*(double a) const { return Vector2d(x * a, y * a); }
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Vector2d operator+=(const Vector2d &v) {
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*this = *this + v;
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return *this;
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}
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// # 4 flops = 1 SQRT, 2 MULTs, 1 ADD
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double norm() { return sqrt(x * x + y * y); }
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// # 3 flops = 2 MULTs, 1 ADD
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double dot(Vector2d v) { return x * v.x + y * v.y; }
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void reset() {
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x = 0;
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y = 0;
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}
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};
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