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virtual.cpp
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49 lines (44 loc) · 1.3 KB
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#include <iostream>
#include <cmath>
class DivideToInt {
protected:
double divisor, dividend;
public:
DivideToInt(double divisor, double dividend) : divisor{ divisor }, dividend{ dividend } {}
virtual int div() const = 0;
virtual ~DivideToInt() {}
};
class CeilingDivide : public DivideToInt {
public:
using DivideToInt::DivideToInt;
virtual int div() const override {
return static_cast<int>(ceil(divisor / dividend));
}
};
class FloorDivide : public DivideToInt {
public:
using DivideToInt::DivideToInt;
virtual int div() const override {
return static_cast<int>(floor(divisor / dividend));
}
};
class NearestDivide : public DivideToInt {
public:
using DivideToInt::DivideToInt;
virtual int div() const override {
return static_cast<int>(round(divisor / dividend));
}
};
int main() {
DivideToInt *divisions[3];
divisions[0] = new CeilingDivide(7.0, 3.3);
divisions[1] = new FloorDivide(7.0, 3.3);
divisions[2] = new NearestDivide(7.0, 3.3);
std::cout << "ceil(7.0 / 3.3) = " << divisions[0]->div() << '\n';
std::cout << "floor(7.0 / 3.3) = " << divisions[1]->div() << '\n';
std::cout << "round(7.0 / 3.3) = " << divisions[2]->div() << '\n';
for (auto& d : divisions) {
delete d;
d = nullptr;
}
}