"reverse_Polish", 计算器

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

//  #define DEBUG

struct  Node;
typedef  struct  Node  * point;
typedef point Stack;

struct  Node
{
   int num;
   point next;
       }  ;
        
Stack CreatStack();
void  Push( int ,Stack);
void  Pop(Stack);
void  MakeEmpty(Stack);
int  IsEmpty(Stack);
int  Top(Stack);

int  main()
{
    char cha;
    int tmpNum1,tmpNum2;
    Stack s=CreatStack();
    while(scanf("%c",&cha)!=EOF)
    {
       if(cha=='\n') {printf("%d\n",Top(s)); MakeEmpty(s); continue;}
       if(cha>47&&cha<58)
          Push(cha%48,s);
       else
       {
          switch (cha)
          {
             case '+': tmpNum1=Top(s);
                       Pop(s);
                       tmpNum2=Top(s);
                       Pop(s);
                       Push(tmpNum2+tmpNum1,s);
                       #ifdef DEBUG
                           printf("%d\n",tmpNum2+tmpNum1);
                                         #endif
                        break;
             case '-': tmpNum1=Top(s);
                       Pop(s);
                       tmpNum2=Top(s);
                       Pop(s);
                       Push(tmpNum2-tmpNum1,s);
                       #ifdef DEBUG
                           printf("%d\n",tmpNum2-tmpNum1);
                                         #endif
                       break;
             case '*': tmpNum1=Top(s);
                       Pop(s);
                       tmpNum2=Top(s);
                       Pop(s);
                       Push(tmpNum2*tmpNum1,s);
                       #ifdef DEBUG
                           printf("%d\n",tmpNum2*tmpNum1);
                                         #endif 
                       break;
             case '/': tmpNum1=Top(s);
                       Pop(s);
                       tmpNum2=Top(s);
                       Pop(s);
                       Push(tmpNum2/tmpNum1,s);
                       #ifdef DEBUG
                               printf("%d\n",tmpNum2/tmpNum1);
                                             #endif
                       break;
          }
       }
    }
    system("pause");
    return 0;
}