Learning Perl: 2.12. Exercises

 

2.12. Exercises See Appendix A for answers to the following exercises: [5] Write a program that computes the circumference of a circle with a radius of 12.5. Circumference is 2p times the radius (approximately 2 times 3.141592654). The answer you get should be about 78.5. [4] Modify the program from the previous exercise to prompt for and accept a radius from the person running the program. So,if users enter 12.5 for the radius,they should get the same number as in the previous exercise. [4] Modify the program from the previous exercise so,if the user enters a number less than zero,the reported circumference will be zero,rather than negative. [8] 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. [8] 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.