//checkSetNotation.c
//John T. Rine
//October 15, 2011

#include"set.h"
#include<stdio.h>

int checkSetNotation(char *inputString)
{
	char oldChar = 'C';
	int position = 0;
	int numberOfCharsInSet = 0;

	numberOfCharsInSet = cntChars(inputString);
	if(*(inputString + position) != '{')
	{
		printf("First character in a set representation must be a '{'\n");
		return 0;
	}
	else if (*(inputString + numberOfCharsInSet - 1) != '}')
	{
		printf("Last character in a set representation must be a '}'\n");
		return 0;
	}
	else if (*(inputString + numberOfCharsInSet - 2) == ',')
	{
		printf("Last two characters in a set representation can't be \",}\"\n");
		return 0;
	}
	else if (*(inputString + 1) == ',')
	{
		printf("First two characters in a set representation can't be \"{,\"\n");
		return 0;
	}
	while(*(inputString + position) != '\0')
	{
		if (*(inputString + position) == ',' && oldChar == ',')
		{
			printf("Can't have two adjacent commas in a set representation\n");
			return 0;
		}
		oldChar = *(inputString + position);
		position ++;
	}
	return 1;
}