C++中的参数传递（函数参数为指针变量，引用类型，数组名）

用一个最经典的swap函数进行举例：

1，指针变量作函数参数

#include <iostream>
using namespace std;

void swap(int *a, int *b) {
	int temp = *a;
	*a = *b;
	*b = temp;
}

int main() {
	int x = 1, y = 2;
	int *m = &x, *n = &y;
	swap(m, n);
	cout << "x=" << x << " y=" << y << endl;
}

 

2，引用类型作函数参数（最优雅的）

#include <iostream>
using namespace std;

void swap(int &a, int &b) {
	int temp = a;
	a = b;
	b = temp;
}

int main() {
	int m = 1, n = 2;
	swap(m, n);
	cout << "m=" << m << " n=" << n << endl;
}

 

3，数组名作函数参数

#include <iostream>
using namespace std;

void swap(char a[], char b[]) {
	char temp;
	int i = 0;
	while (*(a + i) != '\0') {
		temp = *(b + i);
		*(b + i) = *(a + i);
		*(a + i) = temp;
		i++;
	}
}

int main() {
	char m[6] = "hello", n[6] = "nihao";
	swap(m, n); //或者是swap(&m[0],&n[0]);
	cout << "m=" << m << endl;
	cout << "n=" << n << endl;
}