January 10th, 2020 
Project 2-2: Grade Converter
Create an application that converts number grades to letter grades.
Console
Welcome to the Letter Grade Converter
Enter numerical grade: 90
Letter grade: A
Continue? (y/n): y
Enter numerical grade: 88
Letter grade: A
Continue? (y/n): y
Enter numerical grade: 80
Letter grade: B
Continue? (y/n): y
Enter numerical grade: 67
Letter grade: C
Continue? (y/n): y
Enter numerical grade: 59
Letter grade: F
Continue? (y/n): n
Specifications
The grading criteria is as follows:
A 88-100
B 80-87
C 67-79
D 60-67
F <60
Assume that the user will enter valid integers between 1 and 100 for the grades.
The application should only continue if the user enters ‘y’ or ‘Y’ in response.
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