DESCRIPTION

Objectives

To convert a simple program from Scala to Java

To use basic data types to store information

To get user input to acquire information

To present stored information to the user as output

To use simple expressions to manipulate information

To use conditionals to change behavior based on information

To use while loops to repeat behavior (perform basic iteration)

Description

Write a program (LetterGrades.java) that takes a list of grades and determines the number of grades that are As, Bs, Cs, Ds, and Fs. In this problem, we will assume a grade g is an A if g 90, that is greater than or equal to 90, a B if 90 > g 80, a C if 80 > g 70, a D if 70 > g 60, and an F if g < 60.

The program should start by prompting the user with, "How many grades are there?" It should then read in the number of grades N and print out the message: "Please enter all N grades. One per line." where N is replaced with the value entered by the user. The program should then proceed to read in N grades, and for each grade determine what letter grade it is and track the total for the letter grade. After all of the N grades have been entered, the program should output how many of each letter grade were entered, in the form as described below in the sample running.

Sample Run

The following is a sample run. It includes both input and output. For clarity, the input lines are preceded by the symbol >. The input and output are separated afterwards.

How many grades are there?

> 10

Please enter all 10 grades. One per line.

> 65

> 82

> 95

> 73

> 43

> 50

> 90

> 110

> 2

> 86

A: 3

B: 2

C: 1

D: 1

F: 3

Input

Here is just the sample input to the program.

10

65

82

95

73

43

50

90

110

2

86

Output

Here is just the sample output to the program. Notice that the prompts are part of the program's output.

How many grades are there?

Please enter all 10 grades. One per line.

A: 3

B: 2

C: 1

D: 1

F: 3

Hint

To solve this problem you might want to do this incrementally in stages. For example,

Start by reading in a single grade and printing out if it is an A, B, ...

Then have the program start by reading in a value N and reading in N grades. You will want to use a loop (while or do-while).

Then have the program count the number of As read in (and print it out once the N grades have been read).

Then have the program count the number of Bs, and then Cs, etc.