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<html>
	<head>
		<title>
			Assignment 2: GPA Calculator
		</title>
			<script type="text/JavaScript">
			var SENTINEL = 'end';
			var courseArray = new Array();
			var gradeArray = new Array();

			function isValidCourseCode(courseCode) {
				return /[A-Z]{3}[1-9]{1}[0-9]{3}/.test(courseCode);
			}

			var courseCode = "";
			var courseGrade = 0.0;
			var i = 0;

			while (true) {
				courseCode = prompt('Enter course code:');

				if (!courseCode.localeCompare(SENTINEL)) {
					break;
				}

				while (!isValidCourseCode(courseCode)) {
					alert('The input is invalid.');
					courseCode = prompt('Input course code:');

					if (!courseCode.localeCompare(SENTINEL)) {
						break;
					}
				}

				courseGrade = parseFloat(prompt('Enter ' + courseCode + ' grade:'));

				while (!((+courseGrade >= 3 && +courseGrade <= 7) || (+courseGrade == 1.5))) {
					alert('The input is invalid.');
					courseGrade = parseFloat(prompt('Enter ' + courseCode + ' grade:'));
				}

				courseArray[i] = courseCode;
				gradeArray[i] = +courseGrade;
				i += 1;
			}

			var highestGradeIndex = 0;
			var lowestGradeIndex = 0;
			var GPA = 0.0;

			for (i = 1; i < courseArray.length; i++) {
				if (gradeArray[i] > gradeArray[highestGradeIndex]) {
					highestGradeIndex = i;
				} else if (gradeArray[i] < gradeArray[lowestGradeIndex]) {
					lowestGradeIndex = i;
				}

				/* Calcuate GPA here as well */
			}

			var totalCourses = +courseArray.length;
			var highestGradeCourse = courseArray[highestGradeIndex];
			var lowestGradeCourse = courseArray[lowestGradeIndex];


			for (i = 0; i < courseArray.length; i++) {
				/* Print Table */
				/* Access course name by courseArray[i] */
				/* Access grade of course by gradeArray[i] */
				document.writeln(courseArray[i] + ' : ' + gradeArray[i]);
			}

			/* Print extra information (you have them all stored in the variables up here already */

			</script>

		</title>
	</head>
</html>