Infix expression

infix_expr.c

#include <stdio.h>
#include <math.h>
#include <stdbool.h>					
#include "base.h"					

main(){

	_struct * list = NULL;
	FILE * file = fopen("post.ms", "r");
	char value[10] , * pt;
	bool error;

	if(file){

		while(fscanf( file , "%s" , value) > 0 ){

			if( strtol(value, &pt , 10) && !*pt )
				push(&list , atoi(value) );			
			else
				if( ( error = size(list) < 2) ){
					printf("\n Error \n");
					break;
				}
				else
					push( &list , 
						value[0] == '+' ?  pop(&list) + pop(&list) : 
						value[0] == '*' ?  pop(&list) * pop(&list) : 
						value[0] == '-' ?  pop(&list) - pop(&list) : 
						value[0] == '/' ?  pop(&list) / pop(&list) : 0 );
			}

			if(!error)
				print(list);		
		}
		
		getchar();
	}