#include "errorProgramAST.h"

/*

*/

int getNum(void)
{
	/* the array is 121 bytes in size; we'll see in a later lecture how we can improve this code */
	char record[121] = { 0 }; /* record stores the string */
	int number = 0;
	int checkLoopValue = 0;
	int loop = 0;
	int errorLevel = 0;
	/* NOTE to student: indent and brace this function consistent with your others */
	/* use fgets() to get a string from the keyboard */
	fgets(record, 121, stdin);
	/* extract the number from the string; sscanf() returns a number
	* corresponding with the number of items it found in the string */
	checkLoopValue = strlen(record);
	if (checkLoopValue == 1)
	{
		errorLevel = 1;
		number = errorChecker(errorLevel);
	}
	else
	{
		while (loop <= checkLoopValue - 1)
		{
			if (isdigit(record[loop])) //Checking to see if the values in the strings are letters.
			{
				loop++;
			}
			else if (loop == checkLoopValue - 1) // If all characters have been checked, brek the loop.
			{
				break;
			}
			else if (record[loop] == '-')
			{
				errorLevel = 3;
				number = errorChecker(errorLevel);
				break;
			}
			else //If a value in the string is not a character, break the loop and return NULL.
			{
				errorLevel = 2;
				number = errorChecker(errorLevel);
				break;
			}
		}
	}

	if (sscanf(record, "%d", &number) != 1 && number != NULL)
	{
		/* if the user did not enter a number recognizable by
		* the system, set number to NULL*/
		number = NULL;
	}
	return number;
}