Write a program that computes the circumference of a circle with a radius of 12.5. The circumference is 2π times the radius, or about 2 times 3.141592654.

Modify the program from the previous exercise to prompt for and accept a radius from the person running the program.

Write a program that prompts for and reads two numbers, and then prints out the result of the two numbers multiplied together.

Write a program that reads a string and a number, and then prints the string the number of times indicated by the number on separate lines. (Hint: use the x operator.)