#include<iostream>using namespace std;void add(int &c, int &d){ int x, y; cout<<"please input x and y:endl"; cin>> x >> y ; cout <<c << "+" << d << "=" << c + d << endl;...
#include<iostream>using namespace std;void add(int &c, int &d){ int x, y; cout<<"please input x and y:endl"; cin>> x >> y ; cout <<c << "+" << d << "=" << c + d << endl;...