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Ex1. Letter grade calculator (15 marks)

Read a student's score (an integer) from user input and output the corresponding letter grade according to the SJTU conversion rules:

Score	Letter grade
95-100	A+
90-94	A
85-89	A-
80-84	B+
75-79	B
70-74	B-
67-69	C+
65-66	C
62-64	C-
60-61	D
0-59	F

Hint 1: Why do we specify that the score will be an integer? Because we want you to use the switch statement instead of a lot of elseifs. Recall the method to match a variable against a group of values, which is covered in the lectures.

Hint 2: Use num2cell() to avoid typing all the numbers manually.

Sample test case

Input:

99

Output:

A+

Format

You should submit a compressed file containing a Matlab source file ex1.m