Prompt the user to make a selection from $1$ to $3.$ Additionally, inform the user to enter $0$ to end the program.

If the user enters $1,$ the program will ask them to provide a number. You will then output the square root of the number

If the user enters $2,$ the program will ask them to provide two numbers. It will raise the first number to the second number's power. You will then output the resulting calculation $($Be sure to use the built$-$in pow function$)$

If the user enters $3,$ the program will ask them to provide their GPA. It will output their letter grade based on their GPA $($A$,$ B$,$ C$,$ D$,$ F$)$