回答編集履歴
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クラスの追加
test
CHANGED
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@@ -45,3 +45,87 @@
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}
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```
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**追記**
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解決済みにしたのなら、どのようにして解決したのかコードを書いてほしい
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と思います。後から質問を検索してみる人のためにも。
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```C++
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#include <iostream> // cout, endl, boolalpha
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#include <fstream> // ifstream
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#include <cmath> // hypot
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using namespace std;
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class Vector {
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double x, y;
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public:
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Vector(double x = 0, double y = 0) { this->x = x; this->y = y; }
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Vector(const Vector& v) { x = v.x; y = v.y; } // copy constructor
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Vector operator+(const Vector& v) { return Vector(x + v.x, y + v.y); }
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Vector operator-(const Vector& v) { return Vector(x - v.x, y - v.y); }
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double len(const Vector& v) {
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Vector p = *this - v; // operator- を使用
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return hypot(p.x, p.y); // 直角三角形の斜辺 c = hypot(a, b)
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}
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};
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int main()
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{
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ifstream ifs("9th.in"); // input file stream
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if (!ifs) return 1;
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double x, y, r;
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int n;
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ifs >> x >> y >> r >> n;
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Vector v0(x, y);
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cout << boolalpha;
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for (int i = 0; i < n; i++) {
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ifs >> x >> y;
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Vector v(x, y);
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cout << (v0.len(v) < r) << endl;
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}
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}
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```
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