text.cpp

一个中缀表达式的求值算法 可实现表达式的求值

#include<stdio.h>
#include<stdlib.h>
#include"function.h"

#define TRUE 1
#define FALSE 0
#define MAXNUM 100





void main() 
{
char c, infix[MAXNUM], suffix[MAXNUM];
int result;
int flag = TRUE;
while (flag == TRUE) 
{
  printf("输入一个中缀表达式!\nInput:");
  getline(infix, MAXNUM); 
  if(infixtoSuffix(infix, suffix) == TRUE)
   printf("suffix:%s\n", suffix); 
  else 
  {
   printf("无效!\n");
   printf("\n继续? (y/n)");
   scanf("%c", &c);
   if (c == 'n' || c == 'N') flag = FALSE;
   while (getchar() != '\n');
   printf("\n");
   continue;
  }
  if(calculateSuffix(suffix, &result) == TRUE) 
   printf("Result:%d\n", result);
  else 
   printf("无效!\n");
  printf("\n继续? (y/n)");
  scanf("%c", &c);
  if (c == 'n' || c == 'N') flag = FALSE;
  while (getchar() != '\n');
  printf("\n");
}
}