1. Type in the "Hello World" program as mentioned in the Perl lecture notes or textbook and get it to work, that is, run the Perl program and the result will display Hello World. Name the program prog1.pl.
2. Write a program that computes the circumference of a circle with a radius of 20.5. Circumference is 2 times 3.14 times radius. Name the program prog2.pl.
3. Modify prog2.pl from the previous exercise and name it prog3.pl. It should prompt for and accept a radius from the person running the program.
4. Modify prog3.pl, so that if the user enters a number less than zero, the reported circumference will be zero, rather than negative. Name the program prog4.pl.
5. Write a program that prompts for and reads two numbers and prints out the product of the two numbers multiplied together. Name the program prog5.pl