Member Avatar for phpangel

hi guyz, i want to write a program that will find the (sine, cosine and tangent) of adding and subtracting two variables using inheritance and polymorphism concepts. anybody plz help?

appreciate the answer:)

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Good starting point, . is right that the standard library supplies trig routines; below is a simple object-oriented pattern that uses inheritance and polymorphism to compute sin/cos/tan of a + b or a - b while keeping code extensible.

The idea: separate the binary operation (add/sub) from the trig function (sin/cos/tan). Make small abstract bases and derive concrete classes. Compose a Combined object that calls the binary op then the trig op — swap any implementation at runtime without if/switch.

#include <cmath>
#include <memory>

struct BinaryOp {
    virtual double compute(double a, double b) const = 0;
    virtual ~BinaryOp() {}
};
struct Add : BinaryOp { double compute(double a,double b) const override { return a + b; } };
struct Sub : BinaryOp { double compute(double a,double b) const override { return a - b; } };

struct TrigOp {
    virtual double apply(double x) const = 0;
    virtual ~TrigOp() {}
};
struct SinOp : TrigOp { double apply(double x) const override { return std::sin(x); } };
struct CosOp : TrigOp { double apply(double x) const override { return std::cos(x); } };
struct TanOp : TrigOp { double apply(double x) const override { return std::tan(x); } };

struct Combined {
    std::unique_ptr<BinaryOp> bin;
    std::unique_ptr<TrigOp> trig;
    Combined(BinaryOp* b, TrigOp* t) : bin(b), trig(t) {}
    double evaluate(double a,double b) const { return trig->apply(bin->compute(a,b)); }
};

Notes and cautions:

  • std::sin, std::cos, std::tan expect radians. Convert degrees with rad = deg * (std::acos(-1.0)/180.0).
  • tan(x) blows up near odd multiples of pi/2. Check double c = std::cos(x); if (std::fabs(c) < 1e-12) /* handle singularity */.
  • For better numeric stability, reduce large angles with std::fmod(x, 2*std::acos(-1.0)) before calling trig functions.
  • This pattern keeps code clean and demonstrates polymorphism; alternatively an expression-tree (virtual evaluate() nodes) can represent more complex formulas.

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Member Avatar for Grn Xtrm

The cmath library has built in functions to calculate the sin, cos, and tan. Look here for more info:

commented: That'll do just fine! +10
Member Avatar for phpangel

thanx :)

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