fread 讀入掛模板

template<class T>
inline bool scan_d(T &ret)
{
	char c;
	int sgn;
	if(c=getchar(),c==EOF)  return 0;
	while (c != '-' && (c < '0' || c > '9') ) c = getchar();  
	    sgn = (c == '-') ? -1 : 1;  
	    ret = (c == '-') ? 0 : (c - '0');  
 while (c = getchar(), c >= '0' && c <= '9') ret = ret * 10 + (c - '0');  
			    ret *= sgn;  
			    return 1; 
}