第11章 运算符重载.pptVIP

Rational类的使用 #include iostream.h #include Rational.h int main() { Rational r1, r2, r3, r4; double x; cout 输入r1: ; cin r1; cout 输入r2: ; cin r2; r3 = r1 + r2; cout r1 + r2 = r3 endl; r3 = r1 * r2; cout r1 * r2 = r3 endl; r4 = (r1 + r2) * r3; cout (r1 + r2) * r3的值为： r4 endl; x = 5.5 - r1; cout 5.5 - r1的值为： x endl; cout (r1 r2 ? r1 : r2) endl; return 0; } 输入r1: 1 3 输入r2: 2 6 1/3+1/3 = 2/3 1/3*1/3 = 1/9 (r1 + r2) * r3的值为2/27 5.5 - r1的值为：5.16667 1/3 第11章 运算符重载 什么是运算符重载 运算符重载的方法 几个特殊的运算符的重载 自定义类型转换运算符 运算符重载实例 运算符重载实例 完善DoubleArray类 DoubleArray.h #ifndef _array_h #define _array_h #include iostream.h class DoubleArray{ friend ostream operator(ostream os, const DoubleArray obj); friend istream operator(istream is, DoubleArray obj); friend bool operator==(const DoubleArray obj1, const DoubleArray obj2); private: int low; int high; double *storage; public: DoubleArray(int lh = 0, int rh = 0):low(lh), high(rh) { storage = new double [high - low + 1]; } DoubleArray(const DoubleArray arr); DoubleArray operator=(const DoubleArray right); double operator[](int index); const double operator[](int index) const; DoubleArray operator()(int start, int end, int lh); ~DoubleArray() {delete [] storage; } }; #endif DoubleArray.cpp //文件名：DoubleArray.cpp //DoubleArray类的实现 #include cassert #include DoubleArray.h“ DoubleArray::DoubleArray(const DoubleArray arr) { low = arr.low; high = arr.high; storage = new double [high - low + 1]; for (int i = 0; i high -low + 1; ++i) storage[i] = arr.storage[i]; } operator= DoubleArray DoubleArray::o