13518219792
下边内容内容是关于C++计算倒数的的内容，应该是对各位有较大好处。
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#include
using namespace std;
class Var;
class Base {
public:
virtual ~Base() {};
virtual ostream &print(ostream &o) const = 0;
};
ostream &operator<<(ostream &o, const Base &e) { e.print(o); return o; }
class Int : public Base {
const int n;
public:
Int(int m) : n(m) {}
~Int() {}
ostream &print(ostream &o) const { return o << n; }
};
class Var : public Base {
const string var;
public:
Var(string v) : var(v) {}
~Var() {}
ostream &print(ostream &o) const { return o << var; }
};
class Plus : public Base {
public:
~Plus() { delete e1; delete e2; }
ostream &print(ostream &o) const
};
class Times : public Base {
public:
~Times() { delete e1; delete e2; }
{ return new Plus(new Times(e1, e2->d(v)), new Times(e1->d(v), e2)); }
};
class Expr {
public:
};
const Expr operator+(const Expr e1, const Expr e2)
{ return Expr(new Plus(e1.e->clone(), e2.e->clone())); }
{ return Expr(new Times(e1.e->clone(), e2.e->clone())); }
ostream &operator<<(ostream &o, const Expr e) { return o << e.e; }
int main() {
Var vx("x"), va("a"), vb("b"), vc("c");
Expr x(&vx), a(&va), b(&vb), c(&vc);
return 0;
}
