摘要：#ifndef BATTERY_HPP #define BATTERY_HPP class Battery { private:double capacity; public:Battery(double ca = 70) :capacity(ca) {} double get_capacity() 阅读全文

摘要：task5 #ifndef MATRIX_H #define MATRIX_H #include <iostream> #include <cassert> class Matrix { public: Matrix(int n); // 构造函数，构造一个n*n的矩阵 Matrix(int n, 阅读全文

摘要：#ifndef info_HPP #define info_HPP #include<iostream> #include<string> using namespace std; class info{ private:string nickname,contact,city; int n; pu 阅读全文