renaming

lectures/operators/complex.cpp

@@ -0,0 +1,39 @@
+#include <cmath>
+#include "complex.h"
+
+// Assignment operator
+Complex& Complex::operator= (Complex const& rhs) {
+  real_ = rhs.real_;
+  imag_ = rhs.imag_;
+  return *this;
+}
+
+// Addition operator as a member function.
+Complex Complex::operator+ (Complex const& rhs) const {
+  double re = real_ + rhs.real_;
+  double im = imag_ + rhs.imag_;
+  return Complex(re, im);
+}
+
+// Subtraction operator as a non-member function.
+Complex operator- (Complex const& lhs, Complex const& rhs) {
+  return Complex(lhs.Real()-rhs.Real(), lhs.Imaginary()-rhs.Imaginary());
+}
+
+// Unary negation operator.  Note that there are no arguments.
+Complex Complex::operator- () const {
+  return Complex(-real_, -imag_);
+}
+
+// Input stream operator as a friend function
+istream& operator>> (istream & istr, Complex & c) {
+  istr >> c.real_ >> c.imag_;
+  return istr;
+}
+
+// Output stream operator as an ordinary non-member function
+ostream& operator<< (ostream & ostr, Complex const& c) {
+  if (c.Imaginary() < 0)  ostr << c.Real() << " - " << -c.Imaginary() << " i ";
+  else                    ostr << c.Real() << " + " << c.Imaginary() << " i ";
+  return ostr;
+}