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GPA Program. Enter grades and units one at a time. 
Enter q or Q to quit entering grades and calculate GPA.


Enter a grade (A through F): A+

Enter the units for the grade: 4

Enter a grade (A through F): B

Enter the units for the grade: 3.0

Enter a grade (A through F): C

Enter the units for the grade: 2.04

Enter a grade (A through F): B+

Enter the units for the grade: 4 

Enter a grade (A through F): q


GPA = 3.24233

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