Write C code that calculates and prints the volumes of different shapes (Sphere and Frustum ).

The program asks the user to keep reading character (ch) until 'q' is entered. Every time ch is entered, the program does the following:

- if ch is 's', then the program asks the user to enter a float (d) and prints the volume of the sphere.

- if ch is 'f', then the program asks the user to enter three floats (h, b ,and d) and prints the volume of the frustum.

-- Notes:

- consider

- entered characters are case insensitive ( example: to quit you can enter q or Q)

- entered floats should be strictly positive (zeros and negatives are not acceptable, and the user should be informed with a message (invalid number)).

- if the user enters a value of ch other than the one specified, the program should print (invalid choice)