通过void指针实现跨类型变量交换函数

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void fun(void **src,void **dst)
{
	void *tmp;
	tmp = *src;
	*src = *dst;
	*dst = tmp;
}

void swap(void *src,void *dst,int size)
{
	void *tmp = malloc(size);
	memcpy(tmp,src,size);
	memcpy(src,dst,size);
	memcpy(dst,tmp,size);
	free(tmp);
}

int main(void)
{
	int m = 8,n = 9;
	int h = 5,k = 6;
	int *ph = &h,*pk = &k;

	printf("befor swap[%d %d]\n",m,n);
	swap(&m,&n,4);
	printf("after swap[%d %d]\n\n",m,n);
	

	printf("befor fun[%d %d]\n",*ph,*pk);
	//printf("befor fun[%p %p]\n",ph,pk);
	fun((void**)&ph,(void**)&pk);
	printf("after fun[%d %d]\n",*ph,*pk);
	//printf("befor fun[%p %p]\n",ph,pk);
	return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include