一个问题

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流插入和流提取运算符的重载

以流插入运算符为例
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两道例题

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  1. //补写代码如下
  2. //因为ostream类和istream类在头文件iostream中已经被c++设计者们设计好，无法修改，所以无法
  3. //再写一个新的流插入运算符重载成员函数
  4. //只能写一个新的流插入运算符重载全局函数
  6. ostream& operator<<(ostream &os,const CStudent &c)
  7. {
  8.     os<<s.nAge;
  9.     return os;
  10. }

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  1. #include <bits/stdc++.h>
  2. #define ASCII0 48
  3. using namespace std;
  5. class Complex
  6. {
  7.     private:
  8.         int real;
  9.         int imag;
  11.     public:
  12.         Complex(int r = 0, int i = 0) : real(r), imag(i){};
  13.         friend istream &operator>>(istream &is, Complex &c);
  14.         friend ostream &operator<<(ostream &os, const Complex &c);
  15. };
  17. istream &operator>>(istream &is, Complex &c)
  18. {
  19.     char str[10];
  20.     is >> str;
  21.     int x = 0;
  22.     bool b = 1;
  23.     for (int i = 0; i < strlen(str); i++)
  24.     {
  25.         if (str[i] >= '0' && str[i] <= '9')
  26.             x = x * 10 + (int)(str[i] - ASCII0);
  27.         else
  28.         {
  29.             if (b)
  30.             {
  31.                 c.real = x;
  32.                 x = b = 0;
  33.             }
  34.             else
  35.             {
  36.                 c.imag = x;
  37.                 x = 0;
  38.             }
  39.         }
  40.     }
  41.     return is;
  42. }
  44. ostream &operator<<(ostream &os, const Complex &c)
  45. {
  46.     os << c.real << " + " << c.imag << "i ";
  47.     return os;
  48. }
  50. int main(void)
  51. {
  52.     int n = 0;
  53.     Complex c;
  54.     cin >> c >> n;
  55.     cout << c << n;
  56.     return 0;
  57. }