C++我来了

终于开始搞C++, 最后还是逃不过去, 话说其实Python也是可以的...

 

#include "stdafx.h"
#include <vector>
#include <iostream>
using std::vector;
using std::cout;
using std::endl;

void reset(int *p);
void add(int &r);

int _tmain(int argc, _TCHAR* argv[])
{

	vector <int>v = { 1, 2, 3, 4 };
	for (auto &r : v){
		r = r + 1;
	}
	for (auto &r : v){
		cout << "r=" << r << endl;
	}

	int n = 1;

	int *p = &n;

	int &r = n;
	cout << "before n: " << n << endl;
	reset(p);

	cout << "after n: " << n << endl;

	add(r);

	cout << "after n: " << n << endl;

	return 0;
}

void reset(int *p){
	*p = 0;

}

void add(int &r){
	r = 22;

}

 上面的例子说明了一个是拿指针*当形参, 一个拿引用&当形参的例子, 避免混淆.