ptrpara.cc

资深C++讲师授课代码

#include <iostream>
using namespace std;

void func(double* x, double* y);
void func(double m, double n)
{
	double t=m;
	m = n;
	n = t;
}
int main()
{
	double a=1.1, b=2.2;
	func(a, b);
	cout << "a=" << a << ", b=" << b << endl;
	double* p=NULL;
	double* q=NULL;
	p = &a;
	q = &b;
	double t=*p;
	*p = *q;
	*q = t;
	cout << "a=" << a << ", b=" << b << endl;
}