Question

1. write a program that computes the circumference of a circle with a radius of 12.5. Circumference is 2π times the radius (approximately 2 times 3.141592654). The answer you get should be about 78.5. 2. 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 previous exercise. 3. 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 4. 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. 5. 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 up

On question 1-3 can you please answer each script separately. Please Use Perl Scripting

Answer 1

1.

print "Calculating the Circumference of a circle\n";
my $pi = 3.14;
my $radius = 12.5;
my $circumference = 2 * $pi * $radius;
print "The circumference of a circle is " , $circumference;

$perl main.pl
Calculating the Circumference of a circle
The circumference of a circle is 78.5

2.

my $radius = <STDIN>;
chomp $radius;
print "Entered radius is ", $radius;
my $pi = 3.14;
my $circumference = 2 * $pi * $radius;
print "\nThe circumference of a circle is " , $circumference;

12.5
Entered radius is 12.5
The circumference of a circle is 78.5

3.

my $radius = <STDIN>;
chomp $radius;
print "Entered radius is ", $radius;
my $pi = 3.14;
my $circumference = 2 * $pi * $radius;
if ($radius < 0) {
$circumference = 0;
}
print "\nThe circumference of a circle is " , $circumference;

-8
Entered radius is -8
The circumference of a circle is 0

Please do comment for any doubts or modifications!