#include "pch.h"

#include <iostream>

using namespace std;

int &count(int a, int b, int&rs)

{

rs = a + b;

return rs;

}

int main()

{

int a = 2, b = 3, s=0;

// count(a, b, s);

//  cout << s << endl;

cout << "a+b=  " << count(a, b, s) << "   "<<"s=   "<<s<< endl;

count(a, b, s)++;

cout << s << endl;

    std::cout << "Hello World!\n"; 

}

为什么输出的s的值是0，我在前面不是已经调用了函数count()了吗？？