See Section A.1, "Answers to Chapter 2 Exercises " for answers to the following
 Write a program that computes the circumference of a circle with
a radius of 12.5. Circumference is 2 times the radius
(approximately 2 times 3.141592654). The answer you get should be
 Modify the program from the previous exercise to prompt for and
accept a radius from the person running the program. So, if the user
enters 12.5 for the radius, she should get the same number as in the
 Modify the program from the previous exercise so that, if the
user enters a number less than zero, the reported circumference will
be zero, rather than negative.
 Write a program that prompts for and reads two numbers (on
separate lines of input) and prints out the product of the two
numbers multiplied together.
 Write a program that prompts for and reads a string and a number
(on separate lines of input) and prints out the string the number of
times indicated by the number on separate lines. (Hint: Use the
"x" operator.) If the user enters "fred" and
"3," the output should be three lines, each saying
"fred". If the user enters "fred" and
"299792," there may be a lot of output.
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