My friend didn't think making an ABCDF grade calculator was possible taking a percentage (simplified without the percentage sign) and using a switch statement without making multiple cases

Grade Calculator With Switch Statement

<?php

function gradeSwitch($var) {
	$var2 = (int)($var/10);
	echo $var." is a(n)";
	switch($var2) {
		case 10:
		case 9:
			echo "A";
			break;
		case 8:
			echo "B";
			break;
		case 7:
			echo "C";
			break;
		case 6:
			echo "D";
			break;

		default:
			echo "F";
			break;
	}

	echo "<br>";
}