#include?
/*
?*?計算函數
?*?參數buf??????????混合運算的字符首地址
?*?參數excursion????保存偏移量
?*?返回值計算好的數
?*/
double?calculate（const?char?*buf?int?*excursion）;
/*
?*?把字符串的數字和字符分離
?*?參數num??????????保存分離后的數字
?*?參數symbol???????保存分離后的符號
?*?參數sc???????????字符的個數
?*?參數nc???????????數字的個數
?*?參數excursion????保存偏移量
?*/
void?separation_symbol_num（const?char?*buf?double?*num?char?*symbol?int?*sc?int?*nc?int?*excursion）;
void?separation_symbol_num（const?char?*buf?double?*num?char?*symbol?int?*sc?int?*nc?int?*excursion）
{
????const?char?*p?=?buf;
????char?dp?=?0;????????????//小數點標識
????double?dpnum?=?0;???????//小數
????int?dpcount?=?0;????????//小數計數器
????int?scount?=?0;
????int?ncount?=?0;
????int?my_excursion?=?0;
????if（p?==?NULL）
????????return;
????p++;
????while（*p）
????{
????????switch（*p）
????????{
????????????case?‘-‘:symbol[scount++]?=?‘-‘;break;
????????????case?‘+‘:symbol[scount++]?=?‘+‘;break;
????????????case?‘*‘:symbol[scount++]?=?‘*‘;break;
????????????case?‘/‘:symbol[scount++]?=?‘/‘;break;
????????????case?‘（‘://如果符號是‘（’，就調用遞歸函數
?????????????????????num[ncount++]?=?calculate（p+1?&my_excursion）;
?????????????????????//printf（“num?=?%g\n“?num[ncount?-?1]）;
?????????????????????//printf（“my_excursion?=?%d\n“?my_excursion）;
?????????????????????p?+=?my_excursion?+?1;
?????????????????????*（excursion）?+=?my_excursion?+1;
?????????????????????my_excursion?=?0;
?????????????????????break;
????????????case?‘）‘:goto?loop;break;???//如果符號是‘）’，則退出這次遞歸
????????????default://提取數字
?????????????????????dpnum?=?0;
?????????????????????dpcount?=?0;
?????????????????????dp?=?0;
?????????????????????if（*p??‘9‘）
?????????????????????????return;
?????????????????????while?（（*p?>=?‘0‘?&&?*p?<=?‘9‘）?||?*p?==?‘.‘）
?????????????????????{
?????????????????????????if（*p?==?‘.‘）
?????????????????????????{
?????????????????????????????dp?=?1;
?????????????????????????????p++;
?????????????????????????????continue;
?????????????????????????}
?????????????????????????if（dp?==?1）
????????????????????????