c++参数传递

值交换传参

void swap(int, int) //值传递
void swap(int*, int*) //地址传递
void swap(int&, int&) //引用传递

指针的指针传参

#include <iostream>
#include <string>
void find2(char array[], char search, char **ppa);

using namespace std;

int main() {
	char str[] = {"afsdfsdfdf\0"};
	char a = 'd';
	char *p = 0;
	find2(str, a, &p);//find2(str, a, p);传递的是初始化0内存空间的地址，&p才是指针p的地址
	if (0 == p)
	{
		printf("没找到！\n");
	}
	else
	{
		printf("找到了，p = %d", *p);
	}
    return 0;
}

void find2(char array[], char search, char **ppa)
{
	int i;
	for (i=0; *(array + i) != 0; i++)
	{
		if(*(array + i) == search)
		{
			*ppa = array + i;
			break;
		}
		else if(*(array + i) == 0)
		{
			*ppa = 0;
			break;
		}
	}
}