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void parse(char* str)
{
	int left = 0, right = 0;
	intlen = strlen(str);

	while (right <= len&& left <= right) {
		if (isDelimiter(str[right]) == false)
			right++;

		if (isDelimiter(str[right]) == true && left == right) {
			if (isOperator(str[right]) == true)
				printf("'%c' IS AN OPERATOR\n", str[right]);

			right++;
			left = right;
		} else if (isDelimiter(str[right]) == true && left != right
				|| (right == len&&left != right)) {
			char* subStr = subString(str, left, right - 1);

			if (isKeyword(subStr) == true)
				printf("'%s' IS A KEYWORD\n", subStr);

			else if (isInteger(subStr) == true)
				printf("'%s' IS AN INTEGER\n", subStr);

			else if (isRealNumber(subStr) == true)
				printf("'%s' IS A REAL NUMBER\n", subStr);

			else if (validIdentifier(subStr) == true
					&&isDelimiter(str[right - 1]) == false)
				printf("'%s' IS A VALID IDENTIFIER\n", subStr);

			else if (validIdentifier(subStr) == false
					&&isDelimiter(str[right - 1]) == false)
				printf("'%s' IS NOT A VALID IDENTIFIER\n", subStr);
			left = right;
		}
	}
	return;
}