#include
long?fun（char*s）;
#define?N?50
void?main（）?
{
	char?f[3]?=?“0x001213“;?
	int?x?=?fun（f）;
	printf（“%d\n“x）;
}

long?fun（char?*s）?
{??
	int?it;??
	long?sum=0;?
	for（i=0;s[i];i++）??
	{???
		if（s[i]<=‘9‘）
			t=s[i]-‘0‘;??
		else?t=s[i]-‘a‘+10;
		sum=sum*16+t;??
	}?
	return?sum;
}