sizeof

void fun(char str[])
{
printf(",%d\n",sizeof(str));
}
 int main()
 {
 char str[]="hello";
 char *p=str;
 int n=10;
 char a='7';
 printf("%d,%d,%d,%d",sizeof(str),sizeof(p),sizeof(n),sizeof(a));
	 fun(str);//6,4,4,1,4
 return 0;
 }

http://www.cnblogs.com/lidabo/p/3618345.html

http://www.cnblogs.com/lidabo/p/3619598.html