{ $this->firstName = $fname; $this->lastName = $lname; $this->phone = $phone; $this->score = $score; } function calculate() { switch (intval($this->score / 15)) { case 3: return 'B'; case 4: return 'A'; case 5: return 'E'; case 6: return 'O'; default: return intval($this->score / 10) === 4 ? 'B' : 'D'; } } } $firstName = fgets(STDIN); $lastName = fgets(STDIN); $phone = intval(fgets(STDIN)); $score = intval(fgets(STDIN)); $stu; settype($stu, "Student"); $stu = new Grade($firstName, $lastName, $phone, $score); $stu->display(); print "\nGrade: " . $stu->calculate();