076-C++

C++ 输入/输出运算符重载

#include <iostream>using namespace std; class Distance{   private:      int feet;             // 0 到无穷      int inches;           // 0 到 12   public:      // 所需的构造函数      Distance(){         feet = 0;         inches = 0;      }      Distance(int f, int i){         feet = f;         inches = i;      }      friend ostream &operator<<( ostream &output,                                        const Distance &D )      {          output << "F : " << D.feet << " I : " << D.inches;         return output;                  }      friend istream &operator>>( istream  &input, Distance &D )      {          input >> D.feet >> D.inches;         return input;                  }};int main(){   Distance D1(11, 10), D2(5, 11), D3;   cout << "Enter the value of object : " << endl;   cin >> D3;   cout << "First Distance : " << D1 << endl;   cout << "Second Distance :" << D2 << endl;   cout << "Third Distance :" << D3 << endl;   return 0;}