相当强悍

				// Opration Prior.cpp : Defines the entry point for the console application.
				//
				
				#include "stdafx.h"
				#include 
				#include 
				
				char OPTR[10];
				int f[6]={6,8,2,8,1};
				int g[6]={4,7,9,2,1};
				float OPND[10];
				int OP=0,OR=1;
				int m=0;
				
				float Operat(char ch,float x,float y)//算符运算
				 {
				    switch (ch)
				       {
					   case '+':  return x+y;
				//	   case '-':  return x-y;
					   case '*':  return x*y;
				//	   case '/':  return x/y;
				        }
				    printf("ERROR!\n");
					return 44;
				}
				
				int gg(char c)
				{
				  switch (c)
				       {
				           case '+':  return(0);
				           case '*':  return(1);
				           case '(':  return(2);
				           case ')':  return(3);
				           case '#':  return(4);
				       }
				    printf("ERROR!\n");
					return 44;
				}
				
				int Preced(int a,int b)
				 {
				    if(f[a]				        return 1;
				     else if(f[a]==g[b])
				        return 2;
				      else if(f[a]>g[b])
				        return 3;
				       else return 0;
				 }
				
				int main(int argc, char* argv[])
				{
					float x,y;
					int t=0;
					char ch,c;
					OPTR[0]='#';
					printf("Please enter the expression and end with #:");//如  2*(3+4)#
					scanf("%c",&ch);
					while(OPTR[OR-1]!=OPTR[0]||ch!='#')
					 {
						if(ch='0')
							{ m=(ch-'0')+m*10;  scanf("%c",&ch);t=2;}//数字字符转换为数字,置t为2
						else if(!t&&ch!='(')  {printf("Too many opnd!\n");return 44;}//t为0或t不为( 
						else 
						{
							switch (Preced(gg(OPTR[OR-1]),gg(ch)))
							{	
								    case 1: if(t==2){OPND[OP++]=(float)m; m=0;}OPTR[OR++]=ch; scanf("%c",&ch);
									        if(ch=='(')t=1;
									        else t=0;  
											break;
									case 2: OR--; scanf("%c",&ch); break;
									case 3: if(t==2) {OPND[OP++]=(float)m;m=0;}
									        x=OPND[--OP];
									        y=OPND[--OP];c=OPTR[--OR];
									        OPND[OP++]=Operat(c,x,y);
									        if(ch!='#'&&ch!=')'){ OPTR[OR++]=ch;scanf("%c",&ch);t=0;}	   
											else t=1;  break;
							}
						}
					 }
					printf("%f",OPND[0]);
					return 0;
				}