成员变量的初始化

 1 #include<iostream>
 2 using namespace std;
 3 class rectange
 4 {
 5 public:
 6     rectange() :length(3), width(5){ cout << "长方形的面积为：" << length*width << endl; }//在函数头进行初始化
 7     rectange(){ length = 3; width = 4; cout << "长方形的面积为：" << length*width << endl;}//函数赋值
 8 private:
 9     int length;
10     int width;
11     int height;
12 };
13 int main()
14 {
15     rectange a;
16     return 0;
17 }