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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class A{
  6. public:
  7.     int x, y, z;
  8.  
  9.     A() {
  10.         this->x = 0;
  11.         this->y = 0;
  12.         this->z = 0;
  13.     }
  14.  
  15.     void init (int x_in, int y_in, int z_in){
  16.         this->x = x_in;
  17.         this->y = y_in;
  18.         this->z = z_in;
  19.     }
  20.  
  21.     int sum(){
  22.         return this->x + this->y + this->z;
  23.     }
  24.  
  25.     void show_result() {
  26.         int result = sum();
  27.         cout << "sum = " << result << endl;
  28.     }
  29. };
  30.  
  31. class B {
  32. public:
  33.     A a;
  34.     A b;
  35.  
  36.     B() {
  37.         a.init(0, 1, 2);
  38.         b.init(1, 2, 3);
  39.     }
  40.     void show_all_result() {
  41.         a.show_result();
  42.         b.show_result();
  43.     }
  44. };
  45.  
  46.  
  47. int main() { 
  48.  
  49.     B obj_B;
  50.  
  51.     obj_B.show_all_result();
  52. }
  53.  
Success #stdin #stdout 0s 4492KB
comments (?)
stdin 
Standard input is empty
stdout 
sum = 3
sum = 6
https://ideone.com/KU94fC
版本1，增加變數時，需要修改多個地方
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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